A man can row at a speed of 5 km/hr in still water. If he row to a certain point in upstream and back to the starting point in a river which flows at 2 km/hr then average speed of the man for total journey is :
1
\(3\frac{1}{5}\) km/hr
2
\(5\frac{1}{6}\) km/hr
3
\(3\frac{1}{6}\) km/hr
4
\(4\frac{1}{5}\) km/hr