Discussion
A car travels from A to B at a speed of 40 km/hr and returns from B to A at a speed of 60 km/hr. What is the average speed for the entire journey?
Answer: A
When the distance is constant for two speeds x and y, the average speed is the Harmonic Mean of the speeds, not the Arithmetic Mean.
Average Speed = \(\frac{2xy}{x+y}\).
Average Speed = \(\frac{2 \times 40 \times 60}{40+60} = \frac{4800}{100} = 48\) km/hr.
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