A boy covers a distance of 60 km at a speed of 15 km/h by his motorcycle. Then he covers a distance of 48 km at a speed of 12 km/h by his car. Find the average speed of boy

1
11.5 km/h
2
7.5 km/h
3
9.5 km/h
4
10.5 km/h
5
13.5 km/h

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