a train travels the first 30 km of 120 m track with uniform speed of 30 km/hr . what should be the speed of train to cover the remaining distance of track si that its average speed is 60km/hr for entire trip .
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total distance = 120km
avg speed = 60km/h
so total time = 2hours
case i
dis. = 30km speed = 30km/h
so time taken = 1 hour
so remaining dis is 90km time = 2-1=1 hour
so speed = 90km/h
avg speed = 60km/h
so total time = 2hours
case i
dis. = 30km speed = 30km/h
so time taken = 1 hour
so remaining dis is 90km time = 2-1=1 hour
so speed = 90km/h
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