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 ?
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solution:-
total distance = 15+10+75 =100km
time =
1s case = 15/30 = 0.5hour
2ns case = 10/20 = 0.5hour
3rd case = 75/50 = 1.5 hour
total time = 0.5+0.5+1.5 = 2.5hour
average speed = 100/2.5 = 1000/25
= [ 40km/hour ]ans
total distance = 15+10+75 =100km
time =
1s case = 15/30 = 0.5hour
2ns case = 10/20 = 0.5hour
3rd case = 75/50 = 1.5 hour
total time = 0.5+0.5+1.5 = 2.5hour
average speed = 100/2.5 = 1000/25
= [ 40km/hour ]ans
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