Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 36 kmph. For how many minutes does the bus stop per hour?
Choose the correct answer.
A) 20 min
B) 8 min
C) 9 min
D) 10 min
E) 11 min
Due to stoppages, it covers 18 km less.   Time taken to cover 18 km =(18/54)x60 = 20 min   answer : 20 min
<result>A</result>
Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 36 kmph. For how many minutes does the bus stop per hour?