A ferry on the Brahmaputra covers 45 km downstream in 3 hours, but in the same 3 hours upstream it covers only 33 km. What is the ferry's speed in still water, in km/h?

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Accepted Answer

13. Downstream speed = 45/3 = 15 km/h; upstream speed = 33/3 = 11 km/h. Still-water speed = (15 + 11)/2 = 13 km/h (the stream is 2 km/h).

A ferry on the Brahmaputra covers 45 km downstream in 3 hours, but in the same 3 hours upstream it covers only 33 km. What is the ferry's speed in still water, in km/h?

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