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A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long

A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km along the shortest path in 15 min.The width of the river in kmh⁻¹ is

Options

(a) 1
(b) 3
(c) 4
(d) √41

Correct Answer:

3

Explanation:

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