A ladder of weight w rests against a smooth vertical wall, and rests on rough horizontal ground, the coefficient of friction between the ladder and the ground being 1/4. The maximum angle of inclination of the ladder to the vertical, if a man of weight w is to walk to the top of it safely, is tan1 x, where x is___________________?
A. 4
B. 1/3
C. 4-Jan
D. 3
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