An athlete runs 200 meters race in 24 seconds. His speed in km/h is

Answer: Option D

$$\begin{array}{rl}& \text{Speed of athlete},\\ & =\frac{200\text{m}}{24\text{secs}}\\ & =\frac{200\times 18}{5\times 24}\\ & =30\text{km/hour}\end{array}$$