Excluding stoppages, the average speed of a bus is 60 km/hr and including stoppages, the average speed of the bus is 35 km/hr. For how many minutes does the bus stop per hour?	Answers:
A) 22	B) 88	C) 24	D) 20	E) 99
In 1hr, the bus covers 60 km without stoppages and 35 km with stoppages.   Stoppage time = time take to travel (60 - 35) km i.e 25 km at 60 km/hr.   stoppage time = 25/60 hrs = 24 min.   Answer: 24
<result>C</result>
Excluding stoppages, the average speed of a bus is 60 km/hr and including stoppages, the average speed of the bus is 35 km/hr. For how many minutes does the bus stop per hour?