A man rides his bicycle 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of 10 km/hr. What is his average speed for the entire trip?( approximately)

1
12.8 km/hr
2
9.8 km/hr
3
19.8 km/hr
4
13.8 km/hr
5
10.8 km/hr

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