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A and B complete a work in 6 days. If A alone can do the same work in 10 days then B alone will do it in how many days?1. 8 days2. 12 days3. 16 days4. 15 days |
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Answer» Correct Answer - Option 4 : 15 days Given: Time taken by A and B = 6 days Time taken by A = 10 days Formula used: Total work = Time taken × Efficiency Calculation: L.C.M of (6 and 10) = 30 = Total work Efficiency of A and B = 30/6 = 5 units/day Efficiency of B = 30/10 = 3 units/day Efficiency of B = (5 – 3) units/day ⇒ 2 units/day Time taken by B = 30/2 days ⇒ 15 days ∴ B will complete the work in 15 days. |
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