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1. 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
Answer is [b] 10 as,
the time for which the bus stops = the distance reduced/speed per minute
Distance reduced = 54-45=9km
speed per minute= 54/60=9/10
therefore time for which bus stopped = 9/(9/10)=90/9=10minutes
therefore the bus stopped for 10 minutes per hour
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