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A and B together can do a piece of work in 10 days. If A alone can do it in 15 days, then the time taken by B to do the same work alone is

 A and B together can do a piece of work in 10 days. If A alone can do it in 15 days, then the time taken by B to do the same work alone is
a. 15 days
b. 20 days
c. 25 days
d. 30 days – ans
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It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench, 25 m broad and 15 m deep can be dug in 30 days ?

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