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 most appropriate option.
A) 2  B) 6  C) 8  D) 4  E) 10
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km =(9/54x 60) min= 10 min.   ANSW10R 10
<result>E</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?