A boy rides his bicycle 10 km at an a...

A boy rides his bicycle 10 km at an average speed c: 12 km/hr and again travels 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately `10. 4\ k m//h r` b. `10. 8\ k m//h r` c. `1\ k m//h r` d. `12. 2\ k m//h r`

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