A speed of 7 metres per second is the same as :	Choose the correct choice from the following answers.
A) 28.64 km/hr
B) 22 km/hr
C) 30 km/hr
D) 25.2 km/hr
E) None
Sol.   7 m/sec = [7 * 18/5] km/hr = 25.2 km/hr.   Answer 25.2 km/hr
<result>D</result>
A speed of 7 metres per second is the same as :