A motor-boat takes the same time to travel 80 km downstream as it takes to travel 60 km upstream. If the speed of the stream is 5 km/hr, find the speed of the motor-boat in still water.
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Speed of the boat or swimmer in still water = 1/2 * (Downstream Speed + Upstream Speed)
= 1/2 * (18+12)
= 15 km/hr
Speed of the current = 1/2 * (Downstream Speed - Upstream Speed)
= 1/2 * (18-12)
= 3 km/hr
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see above picture I hope it is helpful to you
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