If the sum of upstream and downstream speed is 26 km/hr and the speed of the current is 5 km/hr. Then find time taken to cover 72 km in downward?
Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 26 => x = 13 Downstream speed = 5 + 13 = 18 km/hr Required time = 72/18 = 4 hrs
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