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A man covers the journey from station A to station B at a uniform speed of 36 kmph and returns to A with a uniform speed of 45 kmph, his average speed for the whole journey is:
Answer & Solution
Correct Answer:
Option
A
Average speed for this case is given by,
$$ {\frac{{2xy}}{{x + y}}} ,$$ where X and Y are two different speeds.
Average speed,
$$\eqalign{
& = {\frac{{2 \times 36 \times 45}}{{36 + 45}}} \cr
& = \frac{{36 \times 90}}{{81}} \cr
& = 40\,\,{\text{kmph}} \cr} $$
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