Over a fixed stretch, a boat's upstream and downstream times are in the ratio 5 : 3. Its speed in still water is 16 km/h. How far can it go downstream in 3.5 hours?

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Accepted Answer

70 km. Speeds are inverse to times: D : U = 5 : 3. Still water = (5k + 3k)/2 = 4k = 16 ⇒ k = 4, D = 20 km/h. In 3.5 h: 70 km.

Over a fixed stretch, a boat's upstream and downstream times are in the ratio 5 : 3. Its speed in still water is 16 km/h. How far can it go downstream in 3.5 hours?

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