An athlete runs 200 meter race in 24 seconds. His speed is

The correct answer is Option (4) → 30 km/h

Speed is distance divided by time. With metres and seconds the speed comes out in m/s; to change it to km/h, multiply by \(\displaystyle\frac{18}{5}\), because 1 m/s is 3600 m in an hour, that is 3.6 km/h.

• Speed in m/s: \(\displaystyle\frac{200}{24}=\frac{25}{3}\) m/s

• Changed to km/h: \(\displaystyle\frac{25}{3}\times\frac{18}{5}=30\) km/h