Question

A completes 4/5 of a work in 20 days. He then calls in b and they together finish the remaining work in 3 days. How long b alone would take to do the whole work?

Answer 1

A completed the work in 25 days. A and B together completed the work in 15 days. B alone completed the work = (1/15-1/25)days= 37 1/2 days