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? Select:
A) 12 B) 25 C) 50 D) 10 E) 82
Explanation:   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
<result>D</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?