1.

A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work?

Answer»

6 days



A's 1 day work = 1/10; B's 1 day work = 1/15

(A + B)'s 1 day work = (1/10 + 1/15) = 1/6

So, both TOGETHER will finish the work in 6 days.



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