Excluding stoppages, the speed of a bus is 65 kmph and including stoppages, it is 48 kmph. For how many minutes does the bus stop per hour?
Choose the most appropriate option.
A) 70 min  B) 15 min  C) 20.4 min  D) 15.6 min  E) 40 min
D   15.6 min   Due to stoppages, it covers 17 km less.   Time taken to cover 17 km = (17/65 x 60) min = 15.6 min
<result>D</result>
Excluding stoppages, the speed of a bus is 65 kmph and including stoppages, it is 48 kmph. For how many minutes does the bus stop per hour?