excluding stoppages the speed of bus is 54km hr and including stoppages it is 45km hr for how many min

d1=54km for 1 hour,d2=45km for 1 hour......due to stops it cover 9 km less per hour
so time=(9/54)*60 min=10 min
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SHORCUT:
time rest per hour=((diif of speed)/(max speed))*total time.
time=((54-45)/(54))*60min=10min.
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54-45=9
(9/54)*60=10min
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for stoppage it has cover 9 km less
so to calculate stop time per hour--we can proceed as (9/54)hr=1/6 hr. or 10 min.
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ans is verry simple=9km/h
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excluding stoppages, the speed of bus is 54km/hr and including stoppages,it is 45km/hr.for how many min. does the bus stop per hour?