on a 140 km track , a train travells first 80km at 80kmper hour .how fast must the train travel the next 60km .so the average speed is 60kmperhourfor the entire trip.
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average speed = total distance/time
distance train covered (speed) = 80 km/h
speed = distance/time
if time is more speed is less
there fore, answer = 80 km/h
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