Question
A boat can travel at a speed of 15 km/h in still water.
If the speed of the current is 3 km/h, how long will it take to travel 24 km upstream?Solution
Effective speed upstream = Speed in still water - Speed of current = 15 - 3 = 12 km/h. Time = Distance / Speed = 24 / 12 = 2 hours. Answer: b) 2 hours.
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