Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 42 kmph. For how many minutes does the bus stop per hour?
Choose the most appropriate option.
A) 10 min	B) 7 min	C) 8.2 min	D) 9.6 min	E) 40 min
D   9.6 min   Due to stoppages, it covers 8 km less.   Time taken to cover 9 km = (8/50 x 60) min = 9.6 min
<result>D</result>
Excluding stoppages, the speed of a bus is 50 kmph and including stoppages, it is 42 kmph. For how many minutes does the bus stop per hour?