a train travels the first 15 km at a uniform speed of 30 km/h and next 75 km at a uniform speed of 50 km/h and the last 10 km at a uniform speed of 20 km/h. calculate the average speed
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40 km\h
d1=15km s1=30km\h
d2=10km s2=20km\h
d3=75km s3=50km\h
total time taken=t1+t2+t3
=0.5+0.5+1.5=2.5
speed =distance\time
100\2.5=40km\h
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