Question

Two friends a and b were employed to do a work. initial deadline was fixed at 24 days. both started working together but after 20 days, a left the work and the whole work took 30 days to complete. in how much time can b alone can do the work?

Answer 1

A+b together do the work in 24 days

Therfore a+b one days work = 1/24

In 20days they do 20/24=5/6th of the work

Therefore work left = 1/6

B alone did 1/6 work in 10days

Therefore b alone can do the whole work in 60 days