Excluding stoppages, the speed of a bus is 60 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?  Choices
A) 10 min
B) 12 min
C) 18 min
D) 20 min
E) 15 min
Due to stoppages, it covers 15 km less.   Time taken to cover 15 km = (15/60x 60) min = 15 min   Answer :15 min
<result>E</result>
Excluding stoppages, the speed of a bus is 60 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?