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'Manoj' can complete some work alone in 40 days. 'Sohan' is twice as efficient as 'Rohan' and five times as efficient as 'Manoj'. If 'Manoj' and 'Rohan' start working together, then after how many days should 'Sohan' replace them so that the work gets completed in exactly 15 days?

A 5 days

B 12 days

C 9 days

D 10 days

E None of these

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