a train covers a distance of 10km in 12 minets if its speed is decressed by 5km/h. the time taken by it to cover the same distance will be?
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distance=10km time=12min=12/60=1/5hrs
speed=distance/time
speed=10*5=50km/hr
speed is decreased by 5km/hr
new speed=50-5=45km/h
distance =10km
time=dis/speed
time=10/45=2/9hrs
2/9 hrs=2*60/9=13min 20sec
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