A person cover certain distance with 2 different speed. He travels at the rate of 15 km/h for 8 hours and again at the rate of 30 km/h for 8 hours. Then, find his average speed.

1
22.5 km/h
2
32.4 km/h
3
35.7 km/h
4
14.5 km/h
5
18.75 km/h

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