Question

A and b together can do a work in 60 days and a alone can do it in 80 days. In how many days b alone can do it? 120 days 160 days 200 days 240 days

Answer 1

A+B in 1 day=1/60

A alone in 1 day=1/80

So,B alone in 1 day=1/60 - 1/80=( 80-60)÷4800=20÷4800=1/240

so, B alone can do it in 240 days