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Some persons hired a boat for 3 hours. T...

Some persons hired a boat for 3 hours. The river flows at a speed of 2.5km/hr and the speed of the boat is 7.5km/hr relative to the water. They start from the port rowing along the river flow and they want to be back in 3hrs.Find the value of a if distance travelled by them is (4+a)km

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