1.

A and B together can plough a field in 10 hours but by himself A requires 15 hours. How long would B take to plough the same field?

Answer»

30 hrs



If A and B together can do a piece of work in x days and A alone can do the same work in y 

days, then B alone can do the same work in x y/ y – x days. 

Therefore, the No. of hours REQUIRED by B = 10 × 15/ 15 – 10 = 150/5 = 30 hours.



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