A man travels for 4 hours at a speed of 75 km/h, for next 6 hours at a speed of 65.5 km/h and for next 2 hours at a speed of 54 km/h. What is his average speed (in km/h) for the entire journey?
1
64\(\frac{3}{4}\)
2
64\(\frac{2}{3}\)
3
66\(\frac{3}{4}\)
4
65\(\frac{1}{3}\)