A steel plate d b is sandwiched rigidly between two timber joists each D B/2 in section. The steel will be (where Youngs modulus of steel is m times that of the timber)_________________?

A. BD + mbd)/6D]

B. BD + mbd)/4D]

C. BD3 + mbd3)/6D]

D. BD + mbd3)/4D]

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