A does 20 % less work then B. If A can complete a piece of work in 7 1/ 2h, then B can do it in

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Accepted Answer

Let time taken by B = N Efficiency ∝ 1/Time taken So, if B is 100% efficient, then A is 80% efficient. So, 80/100 = N /(15/2) ∴ N = 6 h

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