a train travel the first 15km at a uniform speed of 30km/h and next 75km at a uniform speed of 50km/h and last 10km at a uniform speed of 20km/h calculate the average speed of whole journey
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Explanation:
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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