A’s efficiency is 40% more than B&

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Target Exam

CUET

Subject

General Test

Chapter

Numerical Ability

Topic

Time and Work

Question:

A’s efficiency is 40% more than B’s efficiency. If A can do a piece of work in 15 hours, then in how many hours will B finish the same work ?

Options:

Correct Answer:

Explanation:

Time ∝ \(\frac{1}{efficiency}\)

A : B

Efficiency ⇒ 7 : 5

Time ⇒ 5 : 7

ATQ,

A's time ⇒ 5R = 15 ⇒ 1R = 3,

So, B's time ⇒ 7R = 7 × 3 = 21 hrs.