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Time, Distance and Speed

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 ?

Answer: C. 10

Due to stoppages, it covers 9 km less.
Time taken to cover 9 km
= (9/54) * 60 min
= 10 min

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