Going with the current, a boat covers 45 km in 3 hours; against the current it covers 24 km in 3 hours. What is the boat's speed in still water (in km/h)?

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Accepted Answer

11.5. Downstream speed = 45/3 = 15 km/h, upstream speed = 24/3 = 8 km/h. Still-water speed = (15 + 8)/2 = 11.5 km/h.

Going with the current, a boat covers 45 km in 3 hours; against the current it covers 24 km in 3 hours. What is the boat's speed in still water (in km/h)?

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