Question:
A train 100 meters long running at 54 km/h takes 20 seconds to pass a bridge. The length of the bridge is
A train 100 meters long running at 54 km/h takes 20 seconds to pass a bridge. The length of the bridge is
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For “train crosses bridge”, distance $=$ train length $+$ bridge length; for “crosses a man/pole”, distance $=$ train length.
Updated On: Aug 12, 2025
- 50 m
- 150 m
- 200 m
- 620 m
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The Correct Option is C
Solution and Explanation
Step 1 (Speed to m/s): $54$ km/h $=54\times\frac{5}{18}=15$ m/s.
Step 2 (Distance in 20 s): $15\times20=300$ m $=$ train $+$ bridge.
Step 3 (Bridge length): $300-100=\boxed{200}$ m.
Step 2 (Distance in 20 s): $15\times20=300$ m $=$ train $+$ bridge.
Step 3 (Bridge length): $300-100=\boxed{200}$ m.
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