An athlete runs 200 meters race in 10sec. His speed is? Select
A) 20km/hr  B) 15km/hr  C) 30km/hr  D) 72km/hr  E) 40km/hr
speed = 200/10= 
<gadget id="calculator">200/10</gadget>
<output>20</output>
20 m/sec= 20 * 18/5 km/hr = 72km/hr   Answer is 72km/hr
<result>D</result>
An athlete runs 200 meters race in 10sec. His speed is?