Some persons hire a boat for 4 hours. Th...

Some persons hire a boat for 4 hours. The river flows at a speed of 5 km/hr and the boat moves with speed of 15 km/hr relative to the water. How far along the flow direction, they can go if they have to return in 4 hrs.

5 km

7.5 km

`(80)/(3)`km

15 km

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