self Maths Puzzle Numerical Ability Age Problem

A man rows boat to a place covering 72 km distance and back in 15 hours. He finds that he
can row 3 km with the stream in the same time as 2 km against the stream. Find the speed of the stream.

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self Other Question

A man rows a boat from point A against current for 10 minutes and then come back with the current for next 10 minutes and reaches to a point B. If distance between A and B is 1 km, find the speed of the current. A train left station A for station B at a certain speed. After travelling for 100 km, the train meets with an accident and could travel at 45th of the original speed and reaches 45 minutes late at station B. Had the accident taken place 50 km further on, it would have reached 30 minutes late at station B. What is the distance between station A and B?