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Rohan and Sunil separately can complete a work in 8 hours and 4 hours respectively. How much time will they take when working together?

Correct Answer: 22/3

Explanation:

Required time taken to complete the work by both together = x y / x + y
(Here x = 8 and y = 4)
∴ Required time = (8 x 4)/(8 + 4) = 32/12 = 22/3 hours


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