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)

$$\eqalign{ & {\text{Average speed}} = \frac{{2 \times 20 \times 25}}{{20 + 25}} \cr & = \frac{{2 \times 20 \times 25}}{{45}} \cr & = \frac{{200}}{9} \cr & = 22\frac{2}{9}\,{\text{km/h}} \cr} $$