Question

A and b can do a piece of work in 40 days. They work together for 8 days and then a quits and b finishes the work in 36 more days. In how many days can b do the piece of work alone?

Answer 1

Answer:

I don't no correct answer but I think 68 days.

Answer 2

"A and B can do a piece of work in 30 days. It means that both of them can do 1/40th of the work in one day. In the 8 days that they worked together they had done 8/40 or 1/5th of the work. The remaining 4/5th of the work was done by B in 36 days. So B alone can do the same work (whole) in (5/4)*36 = 45 days.

"So B does 1/45th of the work in a day. So A alone can do (1/40)-(1/45) = 1/360th part of the work in a day so he will take 360 days to do the work, working alone.

"HOPE IT HELPS

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