Excluding stoppages, the speed of a bus is 90 km/hr and including stoppages, it is 84 km/hr. For how many minutes does the bus stop per hour?	Choose the correct choice from the following options:  A) 18 min  B) 4 min  C) 8 min  D) 6 min  E) 5 min
Due to stoppages, it covers 6 km less.   Time taken to cover 6 km = 6/90 * 60= 
<gadget id="calculator">6/90 * 60</gadget>
<output>4</output>
4 min.   Answer:4 min
<result>B</result>
Excluding stoppages, the speed of a bus is 90 km/hr and including stoppages, it is 84 km/hr. For how many minutes does the bus stop per hour?