Excluding stoppages, the speed of a bus is 54km/hr and including stoppages, it is 45 km/hr. For how many minutes dows the bus stop per hour.
ক. 9
খ. 10
গ. 12
ঘ. 20
উত্তর: 9
ব্যাখ্যা: Due [গণিত] stoppages, it covers 9 km less per hour. Time taken [গণিত] cover [গণিত] .
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