A can do a job in 10 days and B can do it in 15 days. If they work together, how long will it take them to complete the job?
Show answer & explanation
Correct answer: B
Explanation
A completes the work in = 10 days
B completes the work in = 15 days
Combined efficiency = 1/10 + 1/15
= (3 + 2)/30
= 5/30
= 1/6
Time taken = 6 days