It takes Karim an hour to do a job that Rahim can do in 40 minutes. One morning they worked together for 12 minutes; then Karim went away and Rahim finished the job. How long did it take him to finish?

It takes Karim an hour to do a job that Rahim can do in 40 minutes. One morning they worked together for 12 minutes; then Karim went away and Rahim finished the job. How long did it take him to finish?

A 8 min.

B 16 min.

C 20 min.

D 28 min.

Solution

Correct Answer: Option C