Ramu completes a piece of work in 10 days, Raka completes the same work in 40 days. If both of them work together, then the number of days required to complete the work is ______

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Ramu completes a piece of work in 10 days, Raka completes the same work in 40 days. If both of them work together, then the number of days required to complete the work is ______






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