Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. Fir how many minutes does the bus stop per hour:

 Excluding stoppages, the speed of a bus is 54 km/hr and including stoppages, it is 45 km/hr. Fir how many minutes does the bus stop per hour:

A). 9

B). 10

C). 12

D). 20

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