A boy rides his bicycle 10 km at an average speed of 12 km/hr and again travels

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A boy 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. His average speed for the entire trip is approximately?

Options:

A . 10.4 km/hr

B . 10.8 km/hr

C . 11 km/hr

D . 12.2 km/hr

Answer: Option B

Total distance traveled = 10 + 12 = 22 km /hr.Total time taken = 10/12 + 12/10 = 61/30 hrs.Average speed = 22 * 30/61 = 10.8 km/hr.

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