A car travels a certain distance from town A to town B at the speed of 42 km/h and from town B to town A at a speed of 48 km/h. What is the average speed of the car?
Correct Answer: Description for Correct answer:
If two equal distances are covered at different speeds
at A km/h and B km/h respectively, then
Average speed during the whole journey
= \( \Large \frac{2AB}{A+B} km/h \)
Therefore, Average speed of the car
= \( \Large \frac{2 \times 42 \times 48}{42+48} = \frac{2 \times 42 \times 48}{90} = 44.8 km/h \)
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