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A man walks from point X to Y at a speed of 20 km/h, but comes back from point Y to X at a speed of 25 km/h. Find his average speed.
Answer & Solution
Correct Answer:
Option
A
$$\eqalign{
& {\text{Average speed}} = \frac{{2 \times 20 \times 25}}{{20 + 25}} \cr
& = \frac{{2 \times 20 \times 25}}{{45}} \cr
& = \frac{{200}}{9} \cr
& = 22\frac{2}{9}\,{\text{km/h}} \cr} $$
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