Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. For how many minutes does the bus stop per hour?	Choose one
A) 118 min
B) 10 min
C) 18 min
D) 16 min
E) 15 min
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.   Answer:10 min
<result>B</result>
Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. For how many minutes does the bus stop per hour?