Excluding stoppages, the speed of a bus is 72 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) 7 min B) 8 min C) 9 min D) 10 min E) 55.8 min
Due to stoppages, it covers 9 km less.   Time taken to cover 67 km =(67/72)x60 = 55.8 min   answer : 55.8 min
<result>E</result>
Excluding stoppages, the speed of a bus is 72 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?