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A train 150 meters long crosses a pole in 15 seconds. What is the speed of the train in km/hr?
36 km/hr
40 km/hr
50 km/hr
45 km/hr
36 km/hr
Remember the conversion factor: to convert m/s to km/hr, multiply by 18/5. Since 150/15 = 10 m/s, simply compute 10 * 3.6 = 36 km/hr.
Length of the train (distance) = 150 meters, Time taken = 15 seconds.
Speed=TimeDistanceтАЛ├Ч518тАЛ
Remember the conversion factor: to convert m/s to km/hr, multiply by 18/5. Since 150/15 = 10 m/s, simply compute 10 * 3.6 = 36 km/hr.
Students often forget to convert units from m/s to km/hr and mistakenly select 10 as the answer or use the wrong conversion factor (5/18 instead of 18/5).
Calculate speed in m/s
The train covers its own length to cross a pole. Using speed = distance / time:
Speed=15┬аs150┬аmтАЛ=10┬аm/s
Convert m/s to km/hr
To convert from m/s to km/hr, multiply the value by 18/5:
Speed=10├Ч518тАЛ┬аkm/hr
Final Calculation
Perform the multiplication to find the final speed:
Speed=2├Ч18=36┬аkm/hr
A is correct because the speed of the train calculated is 36 km/hr.
This unit conversion logic (multiplying by 18/5 or 5/18) is frequently tested in physics kinematics problems and boat/stream topics.
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