A man covered a distance of 8 km at a speed of 4 km/h, a distance of 12 km at a speed of 3 km/h and a distance of 18 km at a speed of 2 km/h. What is his average speed in the total journey? (Round to two decimal places)
1
2.53 km/h
2
3.53 km/h
3
2.83 km/h
4
2.03 km/h