Three persons individually can perform a particular job j in 5, 6 and 7 hours respectively. What is the longest part of the job that can be done in one hour by two persons working together?

Three persons individually can perform a particular job j in 5, 6 and 7 hours respectively. What is the longest part of the job that can be done in one hour by two persons working together?

A 11/42

B 11/30

C 12/35

D 11/35

Solution

Correct Answer: Option B