self Maths Puzzle

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.

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self Other Question

If the speeds of Dhoni and Sachin were 8 km/hr and 5 km/hr, then after what time will the two meet for the first time at the starting point if they start simultaneously? The length of the circular track is 500 m. 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.