Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?
Choose the correct choice
A) 9 B) 10 C) 12 D) 20 E) 8
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km =(9/54x 60)min	= 10 min.   Answer :10
<result>B</result>
Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?