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J alone can do a piece of work in 7.5 days. K and L together can complete the same work in 5 days. In how many days will J, K and L together complete the same work?1. 5 days2. 3 days3. 4.5 days4. 6 days |
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Answer» Correct Answer - Option 2 : 3 days Given: J can complete the work in 7.5 days K and L can complete the work in 5 days, working together Formula used: The efficiency of a person is equal to its time taken Calculation: Per day efficiency of J = 1/7.5 = 2/15 Per day efficiency of K and L, working together = 1/5 Per day efficiency of J, K and L working together = \(\dfrac{2}{15} + \dfrac{1}{5} = \dfrac{1}{3}\) ∴ Together, they will take 3 days. |
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