A alone does a job in $24$ days and B alone in $8$ days. B is how many times as efficient as A?

Question

A alone does a job in $24$ days and B alone in $8$ days. B is how many times as efficient as A?

Option A

2 times

Option B — Correct answer

3 times

Correct choice.

Option C

4 times

Option D

6 times

Explanation

Efficiency is inverse of time. So $\frac{E_B}{E_A}=\frac{24}{8}=3$.

Chapter Mock 7: Time and Work, Pipe and Cistern