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A and B together can finish a work in 10 days, B and C together can finish the same work in 15 days, and A and C together can finish the same work in 20 days. In how many days can c alone finish the same work?1. 902. 1203. 804. 100 |
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Answer» Correct Answer - Option 2 : 120 Concept Used: If a person can do a task in x days then in 1 day work will be complete 1/x part Calculation: 1/A + 1/B = 1/10 1/B + 1/C = 1/15 1/A + 1/C = 1/20 Then, ⇒ 1/A - 1/C = 1/30 Solving, ⇒ 1/C = 1/120 ∴ In 120 days, C alone can finish the work. |
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