An athlete runs 200 meters race in 36sec. His speed is?  Pick one:
A) 20km/hr B) 15km/hr C) 30km/hr D) 25km/hr E) 40km/hr
speed = 200/36 = 50/9 m/sec   = 50/9 * 18/5 km/hr = 20km/hr   20km/hrnswer is 20km/hr
<result>A</result>
An athlete runs 200 meters race in 36sec. His speed is?