Asghar can do a job in 60 days and both Asghar and Babar can do the same job in 20 days working together. Babar alone can do the same job in:

A) 30 days

B) 60 days

C) 28 days 

D) 45 days

Let Baber take X-days to complete the work alone.

Therefore 1/60 + 1/X= 1/20

So, 1/X  = 1/20 – 1/60

           X = (3–1)/60= 2/60

              = 1/30

So Baber can complete the work alone in= 30 days.

Related MCQs:
  1. If A and B together can complete a job in 15 days and B alone can complete it in 20 days. In how many days can A alone complete job:
  2. If A and B together can complete a job in 15 days and B alone can complete it in 20 days. In how many days can A alone complete job:
  3. A group of 10 students working one hour day complete a job in 12 days. In how rm days will 12 students in group working (hour per day finish the same job?
  4. Alia can complete an assignment in 5 days and Babar can complete the same assignment is 20 days. The time taken by both Alia and Babar to complete the assignment working together is: