Excluding stoppages, the speed of a bus is 72 kmph and including stoppages, it is 60 kmph. For how many minutes does the bus stop per hour?
Excluding stoppages, the speed of a school bus is 48 kmph and including stoppages, it is 40 kmph. For how many minutes does the school bus stop per hour?
Average speed of a train excluding stoppages is 45 km/hr and including stoppages is 36 km/hr. For how many minutes does the train stop per hour?