1.

A works twice as fast as B. if B can complete a work in 12 days independently, the number of days in which A and B can together finish the work is:

Answer»

4 days



That is, if b ALONE can finish the work in 12 days, 

A alone can finish the work in 6 days.

If A can complete a work in x days and B can complete the same work in y days, then, both 

of them together can complete the work in x y/ x+ y days. 

THEREFORE, A and B can together finish the work in 6 × 12/18 days = 4 days.



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