Question
A boat can travel 36 km downstream in 2 hours and 24 km
upstream in 3 hours. Find the speed of the boat in still water and the speed of the stream.Solution
Downstream speed = 36/2 = 18 km/h Upstream speed = 24/3 = 8 km/h Let speed of boat in still water = u, speed of stream = v. u + v = 18 u − v = 8 Add: 2u = 26 ⇒ u = 13 km/h Then v = 18 − 13 = 5 km/h Answer: Boat speed in still water = 13 km/h, stream speed = 5 km/h.
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