An athlete runs 200 metres race in 24 seconds. His speed is :
A
20 km/hr
B
24 km/hr
C
28.5 km/hr
D
30 km/hr
Correct Answer: 30 km/hr
Hints: His speed = 200/24 metre per second = (200/24) × 18/5 km/hr = 30 km/hr