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A boy rides his bicycle 10 km at an average speed of 12 km/hr and travells 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately :
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Average speed }} = \frac{{{\text{Total distance }}}}{{{\text{Total time}}}} \cr
& {\text{Average speed }} = \frac{{{\text{10 + 12 }}}}{{\frac{{10}}{{12}} + \frac{{12}}{{10}}}} \cr
& {\text{Average speed }} = 10.8{\text{ km/hr}} \cr} $$
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