A boat covers a certain distance downstream in 4 hours and returns upstream over the same distance in 6 hours. If the speed of the stream is 2 km/h, find the speed of the boat in still water.

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Accepted Answer

10. Let the boat's still-water speed be b. Equal distances give (b + 2) × 4 = (b − 2) × 6, so 4b + 8 = 6b − 12, giving b = 10 km/h.

A boat covers a certain distance downstream in 4 hours and returns upstream over the same distance in 6 hours. If the speed of the stream is 2 km/h, find the speed of the boat in still water.

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