A train travels the first 15 km at a uniform speed of 30 km per hour the next 75 km at a uniform speed of 50 kilometre per hour and class 10 km at a uniform speed of 20 kilometre per hour calculate the average speed of the train
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Distance=15+75+10=100m
Time=30+50+20=100m/s
average speed=distance/time
s=100/100=1m/s
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