Question

A man can go on a motor boat with a speed of 25 km/hour in still water to a certain upstream point and come back to the starting point in a river which flows at a speed of 15km/hour. Find  the average speed of motor boat for total journey?

A 16 km/hour Correct Answer Incorrect Answer
B 13 km/hour Correct Answer Incorrect Answer
C 18 km/hour Correct Answer Incorrect Answer
D 21 km/hour Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

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