A car covers 16 km at a speed of 4 km/h, 36 km at a speed of 6 km/h and 40 km at a speed of 10 km/h. Find the average speed of the entire journey. 

1
6.57 km/h
2
8.2 km/h
3
9.2 km/h
4
7.5 km/h

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