Excluding stoppages, the speed of a bus is 5454 kmph and including stoppages, it is 4545kmph. For how many minutes does the bus stop per hour?  Choose the correct choice:
A) 12 B) 11 C) 10 D) 9 E) 8
Explanation:   Speed of the bus excluding stoppages =54=54 kmph   Speed of the bus including stoppages =45=45 kmph   Loss in speed when including stoppages =54âˆ’45=9 kmph=54âˆ’45=9 kmph   â‡’â‡’ In 11 hour, bus covers 99 km less due to stoppages.   Hence, time in which the bus stops per hour   = Time taken to cover 99 km   =distancespeed=954 hour=16 hour =distancespeed=954 hour=16 hour =606 min=10 min   ANSWER IS 10
<result>C</result>
Excluding stoppages, the speed of a bus is 5454 kmph and including stoppages, it is 4545kmph. For how many minutes does the bus stop per hour?