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Jack and Finn can finish a work together in 6 hours, while Finn alone can do it in 10 hours. What is the ratio of efficiencies of Jack and Finn?1). 1 : 22). 2 : 33). 3 : 44). 3 : 5 |
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Answer» Let the efficiencies of Jack and Finn be M and N, respectively. We know, TIME to finish WORK is inversely PROPORTIONAL to efficiency. ⇒ 6 × (M + N) = 10 × N ⇒ 6M = 4N ⇒ M/N = 2/3 ∴ Ratio of efficiencies is 2 : 3. |
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