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Amit and Sumit can plough a field in 4 d...

Amit and Sumit can plough a field in 4 days. Sumit alone can plough the field in 6 days. In how many days will Amit alone plough the field? a. `10\ d a y s` b. `12\ d a y s` c. `15\ \ d a y s` d. `14\ d a y s`

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