Question
If the sum of upstream and downstream speed is 20 km/hr
and the speed of the current is 5 km/hr. Then find time taken to cover 45 km in downward?Solution
Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 20 => x = 10 Downstream speed = 5 + 10 = 15 km/hr Required time = 45/15 = 3 hrs
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