A person rows upstream for a distance of 21 km and returns to the starting point. He completes this journey in 10 hours. If the time taken by him in going 7 km downstream is equal to the time taken in going 3 km upstream, then what is the speed of the current?

A person rows upstream for a distance of 21 km and returns to the starting point. He completes this journey in 10 hours.
If the time taken by him in going 7 km downstream is equal to the time taken in going 3 km upstream, then what is the
speed of the current?
1). 3 Km/h
2). $3\frac{1}{2}$ Km/h
3). $1\frac{1}{2}$ Km/h
4). 2 Km/h

            

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