A is 4 times as good a workman as B. A and B together can finish a work in 20 days. In how many days will B alone complete the same work?
Show answer & explanation
Correct answer: B
Explanation
Given:
A = 4B
A + B ⇒ 20 days
According to the formula:
Work Rate = 1 / Time
Let B's rate = x ⇒ A's rate = 4x
A + B = 5x
5x = 1/20
x = 1/100
Therefore, the time taken by B alone = 1/x = 100 days.