Question:
A train 120 metres long crosses a pole in 6 seconds. What is the speed of the train in km/h?
A train 120 metres long crosses a pole in 6 seconds. What is the speed of the train in km/h?
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Distance to cross a pole equals the train's own length.
Updated On: Jul 8, 2026
- 60 km/h
- 72 km/h
- 80 km/h
- 90 km/h
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The Correct Option is B
Solution and Explanation
Step 1: Speed in m/s.
Crossing a pole means covering its own length: \[\text{Speed} = \dfrac{120}{6} = 20 \text{ m/s}\] Step 2: Convert to km/h.
Multiply by \(\dfrac{18}{5}\): \[20 \times \dfrac{18}{5} = \boxed{72 \text{ km/h}}\]
Crossing a pole means covering its own length: \[\text{Speed} = \dfrac{120}{6} = 20 \text{ m/s}\] Step 2: Convert to km/h.
Multiply by \(\dfrac{18}{5}\): \[20 \times \dfrac{18}{5} = \boxed{72 \text{ km/h}}\]
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