Question : A car travels from A to B at the rate of 40 km/h and returns from B to A at the rate of 60 km/h. Its average speed during the whole journey is:
Option 1: 48 km/h
Option 2: 50 km/h
Option 3: 45 km/h
Option 4: 60 km/h
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Correct Answer: 48 km/h
Solution :
Given: A car travels from A to B at the rate of $x$ = 40 km/h and returns from B to A at $y$ = 60 km/h.
The car's average speed is calculated using the formula, $\frac{2xy}{x+y}$.
Average speed = $\frac{2\times 40 \times 60}{40+60}=\frac{4800}{100}$
= 48 km/h
Hence, the correct answer is 48 km/h.
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