Excluding stoppages,the speed of the bus is 54kmph and
including stoppages,it is 27kmph. For how many minutes does the bus stop per hr	Choose the correct choice from the following choices
A) 12 min B) 11 min C) 13 min D) 20 min E) 30 min
Due to stoppages,it covers 27km less.   time taken to cover 27 km is [  27/54 *60= 
<gadget id="calculator">  27/54 *60</gadget>
<output>30</output>
30min   Answer is 30 min.
<result>E</result>
Excluding stoppages,the speed of the bus is 54kmph and
including stoppages,it is 27kmph. For how many minutes does the bus stop per hr