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

4 h
6 h
8 h
10 h

Correct Answer: 6 h

Explanation:

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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