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Time and Work

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Aptitude miscellaneous
  1. A does 20 % less work then B. If A can complete a piece of work in
    71/2h, then B can do it in
    1. 4 h
    2. 6 h
    3. 8 h
    4. 10 h
Correct Option: B

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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