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 from the following answers.
A) 10
B) 9
C) 12
D) 20
E) 18
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km = (9/54 * 60)= 
<gadget id="calculator">(9/54 * 60)</gadget>
<output>10</output>
10 min   10nswer 10)10 mins.
<result>A</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?