If the sum of upstream and downstream speed is 48 km/hr and the speed of the current is 4 km/hr. Then find time taken to cover 84 km in downward?
Let the speed of boat in still water be x km/hr. According to the question, => x + 4 + x − 4 = 48 => x = 24 Downstream speed = 4 + 24 = 28 km/hr Required time = 84/28 = 3 hrs
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