An athlete runs 200 metres race in 24 seconds. What is his speed?  Pick.
A) 20 km/hr
B) 30 km/hr
C) 25 km/hr
D) 27.5 km/hr
E) None of these
Explanation:   Speed = Distance/Time = 200/24 m/s=200/24 × 18/5 km/hr   = 40×34 km/hr = 10×3 km/hr = 30 km/hr   Answer: Option 30 km/hr
<result>B</result>
An athlete runs 200 metres race in 24 seconds. What is his speed?