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A train 150 m long passes a pole in 10 seconds. What is the speed of the train in km/h?
54┬аkm/h
60┬аkm/h
45┬аkm/h
72┬аkm/h
54┬аkm/h
Remember the conversion factor: multiply m/s by 518тАЛ directly to convert into km/h in seconds.
Length of the train L=150┬аm, Time taken to pass the pole t=10┬аs
Speed=TimeDistanceтАЛ
Remember the conversion factor: multiply m/s by 518тАЛ directly to convert into km/h in seconds.
Forgetting to convert the speed from m/s to km/h, which leads to incorrect answers.
Calculate the speed in m/s
The distance covered by the train to pass a pole is equal to its own length. Using the speed formula:
Speed=10┬аs150┬аmтАЛ=15┬аm/s
Convert speed from m/s to km/h
To convert meters per second into kilometers per hour, multiply the speed by 518тАЛ:
Speed=15├Ч518тАЛ=3├Ч18=54┬аkm/h
A is correct because the speed of the train calculates to 54 km/h.
Similar concepts of relative speed and length are frequently tested in train crossing problems involving bridges and platforms.
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