A person covers certain distance in 2 hours at a speed of 10 km/h and some more distance in 4 hours at a speed of 6 km/h. Find his average speed for the entire distance covered.
1
\(9\frac{1}{3}\)
2
\(6\frac{1}{3}\)
3
\(8\frac{1}{3}\)
4
\(7\frac{1}{3}\)