A and B together can complete a work in 12 days. If A alone can complete the work in 20 days, how many days will B alone take to complete the work?
Show answer & explanation
Correct answer: B
Explanation
Given:
A + B complete the work together = 12 days
A completes the work alone = 20 days
A + B's rate = 1/12
A's rate = 1/20
B's rate = 1/12 − 1/20
= 5/60 − 3/60
= 2/60
= 1/30
B will complete the work alone = 30 days