Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?
A. 17 1/7 min
B. 15 1/7 min
C. 19 1/7 min
D. 7 1/7 min
Be the first to comment if anything wrong with this mcq
civil engineering Mcqs
- highway engineering Mcqs
- airport engineering Mcqs
- applied mechanics and graphic statics Mcqs
- surveying Mcqs
- tunnel engineering Mcqs
- design of masonry structures Mcqs
- building materials and construction Mcqs
- soil mechanics and foundation engineering Mcqs
- structural analysis Mcqs
- water supply engineering Mcqs
- engineering economy Mcqs
- structural design specifications Mcqs
- railway engineering Mcqs
- irrigation water resources engineering and hydrology Mcqs
- environmental engineering Mcqs
- rcc structures design Mcqs
- design of concrete structures Mcqs
- waste water engineering Mcqs
- design of steel structures Mcqs
- construction planning and management Mcqs
- estimating and costing Mcqs
- strength of materials Mcqs
- theory of structures Mcqs
- dock and harbor engineering Mcqs
- fluid mechanics Mcqs
- elements of remote sensing Mcqs
- hydraulics and fluid mechanics Mcqs
economics Mcqs
- the national economy Mcqs
- profit maximizing under perfect competition and monopoly Mcqs
- application of economics Mcqs
- the aggregate demand aggregate supply model Mcqs
- surplus Mcqs
- money interest rates and output Mcqs
- average and total cost Mcqs
- stabilization adjustment reform and privatization Mcqs
- risks and diversification efficient market hypothesis Mcqs
- the phillips curve Mcqs
- supply and demand Mcqs
- capital formation investment choice information technology and technical progress Mcqs
- aggregate supply unemployment and inflation Mcqs
- elasticity Mcqs
- comparative gdp Mcqs
- roots of modern macroeconomics Mcqs
- production factors Mcqs
- poverty malnutrition and income inequality Mcqs
- trade regulations and industrial policies Mcqs
- monetary union Mcqs
- exchange rate systems and currency crises Mcqs
- economic development in historical perspective Mcqs
- exchange rate determination Mcqs
- monopoly competition Mcqs
- the balance of payments Mcqs
- inflation productivity Mcqs
- macroeconomic issues and analysis Mcqs
- employment migration and urbanization Mcqs
- macroeconomic policy tools Mcqs
- supply side policies Mcqs
- exchange rate adjustments and the balance of Mcqs
- miscellaneous Mcqs
- taxation Mcqs
- trade policies for the developing nations Mcqs
- markets efficiency and the public interest Mcqs
- the external debt and financial crises Mcqs
- budget deficits and the trade balance Mcqs
- alternative theories of the firm Mcqs
- public goods Mcqs
- the meaning and measurement of economic development Mcqs
- characteristics and institutions of developing countries Mcqs
- agriculture irrigation system of pakistan Mcqs
- education health and human capital Mcqs
- economic problems of developing countries Mcqs
- theories of economic development Mcqs
- basic of economics Mcqs
- consumer theory vs real consumers Mcqs
- applied microeconomics Mcqs
- long term economic growth Mcqs
- externality internality Mcqs
- fiscal and monetary policy Mcqs
- prices wages taxes Mcqs
- balance of payments aid and foreign investment Mcqs
- international factor movements and multinational corporations Mcqs
- entrepreneurship organization and innovation Mcqs
- the international economy and globalization Mcqs
- population and development Mcqs
- non tariff trade barriers Mcqs
- foundations of modern trade theory Mcqs
- global economic development Mcqs
- market Mcqs
- rural poverty and agricultural transformation Mcqs
- regional trading arrangements Mcqs
- foreign exchange Mcqs
- introduction to economics Mcqs
- world economy miscellaneous Mcqs
- sources of comparative advantage Mcqs
- natural resources and the environment toward sustainable development Mcqs
- monopoly Mcqs
- asymmetric information Mcqs
- income inequality Mcqs
- labour market Mcqs
- tariffs Mcqs
- development planning and policy making the state and the market Mcqs
- oligopoly Mcqs
- industrial development Mcqs
- costs supply and perfect competition Mcqs
- human capital Mcqs
- monetary fiscal and incomes policy and inflation Mcqs
- stocks Mcqs
political science Mcqs
- bureaucracy Mcqs
- electorate and representation Mcqs
- property Mcqs
- ibn e khaldun Mcqs
- rule of law muslim political thoughts Mcqs
- sovereignty of state Mcqs
- parliamentary and presidential systems Mcqs
- the rights Mcqs
- france constitution Mcqs
- liberty Mcqs
- pakistan constitution Mcqs
- india constitution Mcqs
- political parties and pressure group Mcqs
- usa federalism Mcqs
- international law Mcqs
- state of local govt Mcqs
- plato Mcqs
- usa constitution Mcqs
- liberalism Mcqs
- al ghazali Mcqs
- development theories and under development Mcqs
- constitutional development and national movement in subcontinent Mcqs
- marxian socialism Mcqs
- marxian theory of origin of state Mcqs
- u s s r constitution Mcqs
- nizam ul mulk tusi Mcqs
- the state Mcqs
- england constitution Mcqs
- nature theories and state function Mcqs
- constitution and constitutional government Mcqs
- allama iqbal Mcqs
- shah walliullah Mcqs
- public opinion Mcqs
- cabinet government Mcqs
- al mawardi muslim political thoughts Mcqs
- muslim political thoughts al farabi Mcqs
- justice Mcqs
- freedom of speech and press role Mcqs
- western political thoughts Mcqs
- origin of state Mcqs
- evolutionary socialism Mcqs
- fascism Mcqs
- democracy Mcqs
- aristotle Mcqs
- equality Mcqs
statistics Mcqs
- sample linear regression Mcqs
- normal distribution Mcqs
- presentation of data Mcqs
- statistical inference Mcqs
- measures of location Mcqs
- basic statistics Mcqs
- correlation and regression Mcqs
- sampling Mcqs
- binomial and hyper geometric probability Mcqs
- index number Mcqs
- hypothesis testing Mcqs
- measures of dispersion Mcqs
electrical engineering Mcqs
- economics of power generation Mcqs
- analog electronics Mcqs
- solid state switching circuits Mcqs
- parallel circuits Mcqs
- switchgear and protection Mcqs
- op amp circuits Mcqs
- transistor audio power amplifiers Mcqs
- electrostatics Mcqs
- heating and welding Mcqs
- multi stage transistor amplifiers Mcqs
- passive filters Mcqs
- network theorems Mcqs
- regulated d c power supply Mcqs
- a c fundamentals circuits and circuit theory Mcqs
- electromagnetic induction Mcqs
- power electronics Mcqs
- magnetism and electromagnetism Mcqs
- transformers Mcqs
- modulation and demodulation Mcqs
- d c generators Mcqs
- semiconductor theory Mcqs
- single phase induction motors Mcqs
- semiconductor diode Mcqs
- hybrid parameters Mcqs
- digital electronics Mcqs
- oscillators Mcqs
- earthing or grounding Mcqs
- single stage transistor amplifiers Mcqs
- d c motors Mcqs
- transistor biasing Mcqs
- amplifiers with negative feedback Mcqs
- basic electrical Mcqs
- electronic instruments Mcqs
- synchronous motors Mcqs
- field effect transistors fet Mcqs
- magnetic circuit Mcqs
- control systems Mcqs
- industrial drives Mcqs
- power generation Mcqs
- series parallel circuits Mcqs
- transistor tuned amplifiers Mcqs
- electrical engineering materials Mcqs
- rectifiers and converters Mcqs
- integrated circuits Mcqs
- scr silicon controlled rectifiers Mcqs
- cables Mcqs
- polyphase induction motors Mcqs
- measurement and instrumentation Mcqs
- transistors Mcqs
- electrical machine design Mcqs
- electrolysis and storage of batteries Mcqs
- electric traction Mcqs
- transmission and distribution Mcqs
judiciary and law Mcqs
- police order 2002 Mcqs
- muslim family law ordinance 1961 Mcqs
- good conduct prisoners probational release rules 1927 Mcqs
- offences of zina ordinance 1979 Mcqs
- family courts act 1964 Mcqs
- court fees act of 1870 Mcqs
- 1872 contract act Mcqs
- civil procedure 1908 Mcqs
- control of narcotic substances act 1997 Mcqs
- offenders ordinance probation 1960 Mcqs
- national accountability ordinance 1999 Mcqs
- medical jurisprudence Mcqs
- specific relief act 1877 Mcqs
- prisoners probational release act 1926 Mcqs
- code of criminal procedure 1898 Mcqs
- pakistan panel code 1860 Mcqs
- property hudood ordinance 1979 Mcqs
- west pakistan civil courts ordinance 1962 Mcqs
- limitation act 1908 Mcqs
- pakistan constitution 1956 Mcqs
- anti terrorism act 1997 Mcqs
- pakistan constitution 1973 Mcqs
- sale of goods act 1930 Mcqs
- constitution of pakistan 1962 Mcqs
- executive order on parole 1934 Mcqs
- qanun e shahadat 1984 Mcqs
mechanical engineering Mcqs
- compressors gas turbines and jet engines Mcqs
- theory of machines Mcqs
- nuclear power plants Mcqs
- engineering materials Mcqs
- strength of materials mechanical engineering Mcqs
- thermodynamics Mcqs
- heat transfer Mcqs
- i c engines Mcqs
- steam boilers engines nozzles and turbines Mcqs
- engineering mechanics Mcqs
- fluid mechanics mechanical engineering Mcqs
- production technology Mcqs
- machine design Mcqs
- hydraulic machines Mcqs
- workshop technology Mcqs
- refrigeration and air conditioning Mcqs
english literature Mcqs
- introduction to literary theory Mcqs
- miscellaneous literature Mcqs
- famous playwright poet and others Mcqs
- introduction to literary studies Mcqs
- cultural and literary in modernity Mcqs
- ages era period Mcqs
- cultural and literary english renaissance Mcqs
- modern poetry and poetics Mcqs
- medieval literature and culture Mcqs
- african american literature Mcqs
- the gothic novel Mcqs
- american literature Mcqs
- language and linguistics Mcqs
- english romantic poetry Mcqs
- literary theory and criticism Mcqs
- cultural and literary 18th 19th centuries Mcqs
software engineering Mcqs
- software metrics Mcqs
- software modelling Mcqs
- advanced software engineering Mcqs
- software processes models software development Mcqs
- requirement engineering Mcqs
- basics of software engineering Mcqs
- software reliability and fault tolerance Mcqs
- architectural design Mcqs
- software evolution Mcqs
- dependability and security Mcqs
- software engineering types Mcqs
- software design Mcqs
- software testing and quality management Mcqs
- software management Mcqs
- design and implementation Mcqs
mathematics Mcqs
- arithmetic Mcqs
- volume and surface area Mcqs
- mixtures and allegations Mcqs
- probability Mcqs
- permutations and combinations Mcqs
- percentage Mcqs
- men food Mcqs
- compound interest Mcqs
- races and games Mcqs
- time distance Mcqs
- mensuration Mcqs
- height and distance Mcqs
- time and work Mcqs
- discount Mcqs
- quadratic equations Mcqs
- volumes Mcqs
- stocks and shares Mcqs
- average Mcqs
- problems on l c m and h c f Mcqs
- boats and streams Mcqs
- simple equations Mcqs
- odd man out series Mcqs
- interest Mcqs
- basic maths Mcqs
- areas Mcqs
- simplification and approximation Mcqs
- partnership Mcqs
- ratio and proportion Mcqs
- profit and loss Mcqs
- pipes and cisterns Mcqs
- problems on numbers Mcqs
pakistan current affairs Mcqs
- current governors of pakistan Mcqs
- current inspector generals of police Mcqs
- current federal ministers Mcqs
- current chief justices Mcqs
- current ambassadors of pakistan Mcqs
- current provincial ministers balochistan Mcqs
- current provincial ministers sindh Mcqs
- current chief ministers of pakistan Mcqs
- current provincial ministers kpk Mcqs
- current provincial ministers punjab Mcqs
- current presidents chairmen ceos Mcqs
- election 2018 Mcqs
- gilgit baltistan current ministers Mcqs