Going with the current, Lakshmi's boat covers 45 km in 2.5 hours; going against it, the boat covers 28 km in 3.5 hours. What is the boat's speed in still water (in km/h)?

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Accepted Answer

13. Downstream speed = 45/2.5 = 18 km/h; upstream speed = 28/3.5 = 8 km/h. Still-water speed = (18 + 8)/2 = 13 km/h.

Going with the current, Lakshmi's boat covers 45 km in 2.5 hours; going against it, the boat covers 28 km in 3.5 hours. What is the boat's speed in still water (in km/h)?

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