A boat which has a speed of 5 km h - 1 in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water (in km h - 1 ) is

Question

A boat which has a speed of 5 km h - 1 in still water crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water (in km h - 1 ) is, 3, 4, 21, 1

MARKS App · Accepted Answer

Speed along the shortest path = v → R ⇒ | v → R | = distance time = 1 ( 15 60 ) km h − 1 ⇒ | v → R | = 4 km h − 1 ∴ Speed of water, v → water = 5 2 − 4 2 = 3 km h − 1

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