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?	Pick
A) 9
B) 10
C) 12
D) 20
E) 14
Due to stoppages, it covers 9 km less.   Time taken to cover 9 km =(9* 60)/54= 
<gadget id="calculator">(9* 60)/54</gadget>
<output>10</output>
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?