1.

A is twice as fast as B. If B alone can do a piece of work in 30 days, in what time can A and B together complete the work?

Answer»

10



A can do the work in 30/2 i.e., 15 DAYS.

A and B's one DAY's work = 1/15 + 1/30 = (2 + 1)/30 = 1/10

So A and B together can do the work in 10 days.



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