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:
A) 5
B) 4
C) 7
D) 9
E) None of these
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km = 954×60954×60 = 10 min.   Option(None of these) is correct
<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?