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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 ? |
27 21 29 25 |
21 |
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. |
