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speed of boat at still water = 5 km/h
width of the river = 1 km
time of crossing the river = 15 minutes
solve for the velocity of the water = Vw
Solving for the resultant velocity Rv :
Rv = distance traveled / time of travel
Rv = 1 km / 15 minutes
Rv = 1 km / 0.25 h
Rv = 4 km/h
Solving for the velocity of water , Vw
Rv^2 = Vboat^2 - Vw^2
4^2 = 5^2 – Vw^2
16 = 25 – Vw^2
Vw^2 = 25-16
Vw^2 = 9
Vw = 3 km/h is the velocity of the river water
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