Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 43 kmph. For how many minutes does the bus stop per hour?  Choose the most appropriate option
A) 70 min  B) 16 min  C) 20 min  D) 8.4 min  E) 40 min
D   8.4 min   Due to stoppages, it covers 7 km less.   Time taken to cover 9 km = (7/50 x 60) min = 8.4 min
<result>D</result>
Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 43 kmph. For how many minutes does the bus stop per hour?