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 one:
A) 9
B) 10
C) 12
D) 20
E) 25
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km =(9/54 x 60) min	= 10 min   Answer:10
<result>B</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?