Question
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 rip is approximately :
Answer: Option B
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Total distance travelled = (10 + 12) km/hr = 22 km/hr
Total time taken = `(10/12 + 12/10)` hrs. = `61/30` hrs.
`:.` Average speed = `(22 xx 30/61)` km/hr = 10.8 km/hr.
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