A speed of 20 metres per second is the same as :	Choose the correct choice.
A) 72 km/hr  B) 66 km/hr  C) 60 km/hr  D) 77.5 km/hr  E) None
Sol.   20 m/sec = [20 * 18/5] km/hr = 72 km/hr.   72 km/hrnswer 72 km/hr
<result>A</result>
A speed of 20 metres per second is the same as :