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.
A. $$22\frac{2}{9}\,{\text{km/h}}$$
B. $$23\frac{2}{9}\,{\text{km/h}}$$
C. $$25\frac{2}{9}\,{\text{km/h}}$$
D. $$24\frac{2}{9}\,{\text{km/h}}$$
Answer: Option A
Solution (By Examveda Team)
$$\eqalign{ & {\text{Average speed}} = \frac{{2 \times 20 \times 25}}{{20 + 25}} \cr & = \frac{{2 \times 20 \times 25}}{{45}} \cr & = \frac{{200}}{9} \cr & = 22\frac{2}{9}\,{\text{km/h}} \cr} $$This Question Belongs to Arithmetic Ability >> Speed Time And Distance
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