Still-water speed and stream speed are in the ratio 9 : 1 for a certain boat. Rowing upstream it covers 32 km in 4 hours. How far can it go downstream in the same 4 hours?

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Accepted Answer

40 km. Upstream = 8k = 32 ÷ 4 = 8 ⇒ k = 1. Downstream = 10k = 10 km/h; in 4 hours: 40 km.

Still-water speed and stream speed are in the ratio 9 : 1 for a certain boat. Rowing upstream it covers 32 km in 4 hours. How far can it go downstream in the same 4 hours?

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