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?


A) 45 km/h

B) 46 km/h

C) 44 km/h

D) None of the above

Correct Answer:
D) None of the above

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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