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Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour

 Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?


[A] 9
[B] 10
[C] 12
[D] 20
ANS : B
Explanation:
Due to stoppages, it covers 9 km less.
Time taken to cover 9 km = [(9/54)*60 min = 10 min.

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