Answer: B
Explanation
Two things to give attention on this question.
First time is in minutes, we need to change it to seconds to get speed in m/sec,
then we need to get the final answer in km/hr.
So lets solve this.
Speed=Distance/Time
Distance=650meter
Time=5 minutes=300sec
Speed=600/300=2m/sec
⇒2×185km/hr=7.2km/hr