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A and B work together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in:1. 5 days2. 20 days3. 11 days4. 25 days |
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Answer» Correct Answer - Option 2 : 20 days Given: A and B work together can do a piece of work in 12 days B alone can finish it in 30 days Calculation: Work done by (A + B)'s in 1 day = 1/12 days Work done by B's in 1 day = 1/30 days Work done by A's in 1 day = (1/12 – 1/30) ⇒ (5 – 2)/60 = 1/20 ∴ A alone can finish the work in 20 days. |
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