Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour? Choose the correct choice from the following options:
A) 5 min
B) 2 min
C) 6 min
D) 10 min
E) 3 min
Explanation:   Due to stoppages, it covers 9 km less.   Time taken to cover 9 km =(9/24*60)=10 min   ANSWER:10 min
<result>D</result>
Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?