Excluding stoppages, the average speed of a bus is 50 km/hr and including stoppages, the average speed of the bus is 40 km/hr. For how many minutes does the bus stop per hour?	Choose the correct choice from the following.
A) 12 min
B) 18 min
C) 16 min
D) 20 min
E) 26 min
In 1hr, the bus covers 50 km without stoppages and 40 km with stoppages.   Stoppage time = time take to travel (50 - 40) km i.e 10 km at 50 km/hr.   stoppage time = 10/50 hrs   = 12 min   12 minnswer: 12 min
<result>A</result>
Excluding stoppages, the average speed of a bus is 50 km/hr and including stoppages, the average speed of the bus is 40 km/hr. For how many minutes does the bus stop per hour?