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A boat running upstream covers a distance of 10 km in 30 min and while running downstream, it covers the same distance in 25 min away and return, then the speed of the water current is ?
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- 2 km/h
- 3 km/h
- 1/2 km/h
- 1 km/h
Correct Option: C
Speed upstream = 10 / (30/60) = (10 x 60)/30 = 20 km/h
Speed downstream = 10/(25/60) = (10 x 60)/25 = 24 km/h
∴ Speed of the river's current = (24 - 20)/2 = 4/2 = 2 km/h
