During a journey of 80km a train covers first 60km at 40kmph and next 20 km at 20kmph.what is the average speed?
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time =2.5hour
distance=80km
avg.speed=total speed by total time
80/2.5=32 km/ hour
distance=80km
avg.speed=total speed by total time
80/2.5=32 km/ hour
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