An athlete runs 200 metres race in 24 seconds. His speed is
Select the correct option.
A) 20 km / hr
B) 24 km /hr
C) 28.5 km / hr
D) 30 km / hr
E) None
Sol.   Speed = 200 / 24 m/sec = 25 / 3 m/sec   = (25/3 x 18 / 5) km / hr = 30 km / hr.   Answer 30 km / hr
<result>D</result>
An athlete runs 200 metres race in 24 seconds. His speed is