Question

Alan is thrice as good a workman as bob and so he takes 60 days less than bob for doing a job. find the time in which they can do it together.

Answer 1

the efficiency of Alan and Bob in the ratio = 3:1

So the ratio of time taken to do the work = 1:3

the difference in ratio is 2 which means 60 days.

2 = 60 days

1 = 30 days.

3 = 90 days.


So Alan will take 30 days and Bob will take 90 days.

together they will take 45/2 days answer.