A person rows a distance of 12 kms in down stream and returns to the starting point. The difference between the times taken to travel in down stream and that of upstream is 6 hours. If he doubles his speed throughout the above trip, then the difference between the times taken to cover in down stream and upstream is 1 hour. Then the speed of the current in km per hour is
1
\(2 \frac{2}{3}\)
2
\(2 \frac{1}{3}\)
3
\(2 \frac{1}{2} \)
4
\(2 \frac{3}{4}\)