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 trip is approximately:
Option 1: 10.4 km/hr
Option 2: 10.8 km/hr
Option 3: 11.0 km/hr
Option 4: 12.2 km/hr
Correct Answer: 10.8 km/hr
Solution :
Average speed = $\frac{total \;distance}{total \;time}$
Average speed = $\frac{10+12}{\frac{10}{12}+ \frac{12}{10}} = \frac{22}{244}\times 120 $
= 10.8 km/hr
Hence, the correct answer is 10.8 km/hr.
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