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A train travels the first 15km at uniform speed of 30km/h next 10 km at uniform speed of 20 km/h and final 75 km at uniform speed of 50 km/h . the average

speed for the entire journey of the train ?


40 km\h
d1=15km s1=30km\h
d2=10km s2=20km\h
d3=75km s3=50km\h

total time taken=t1+t2+t3
speed =distance\time
0 0 0
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