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A 120-meter-long train is running at a speed of 24 km/h. How long will Updated on: 11 Mar 2026, 09:17
Originally posted by Bunuel on 06 Feb 2026, 09:19.
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A 120-meter-long train is running at a speed of 24 km/h. How long will it take the train to cross a bridge that is 300 meters long, from the moment the locomotive enters the bridge until the last carriage clears?

A. 60 seconds
B. 63 seconds
C. 66 seconds
D. 70 seconds
E. 72 seconds

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A 120-meter-long train is running at a speed of 24 km/h. How long will 14 Feb 2026, 13:15
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Bunuel
A 120-meter-long train is running at a speed of 24 km/h. How long will it take the train to cross a bridge that is 300 meters long, from the moment the locomotive enters the bridge until the last carriage clears?

A. 60 seconds
B. 63 seconds
C. 66 seconds
D. 70 seconds
E. 72 seconds
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GMAT Club Official Solution:

To fully clear the bridge, the train must travel 120 + 300 = 420 meters.

Speed: 24 km/h = 24 * 1000/3600 = 20/3 m/s

Time = 420/(20/3) = 420 * 3/20 = 63 seconds

Answer: B.
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A 120-meter-long train is running at a speed of 24 km/h. How long will 06 Feb 2026, 13:31
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Bunuel
A 120-meter-long train is running at a speed of 24 km/h. How long will it take the train to cross a bridge that is 300 meters long, from the moment the locomotive enters the bridge until the last carriage clears?

A. 60 seconds
B. 63 seconds
C. 66 seconds
D. 70 seconds
E. 72 seconds

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Speed of the train is 24 kmph = 24*(5/18) = (20/3) metre per second.

The length of the train = 120 metre.

The length of the bridge = 300 metre.

Total length = (300+120) = 420 metre.

Time taken = 420 /(20/3)

= 63 seconds.

Option B
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A 120-meter-long train is running at a speed of 24 km/h. How long will 07 Feb 2026, 01:12
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Bunuel
A 120-meter-long train is running at a speed of 24 km/h. How long will it take the train to cross a bridge that is 300 meters long, from the moment the locomotive enters the bridge until the last carriage clears?

A. 60 seconds
B. 63 seconds
C. 66 seconds
D. 70 seconds
E. 72 seconds

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Total distance = 120 + 300 m = 420m
Time = (420/1000 * 24) * 3600 sec = 63 sec
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A 120-meter-long train is running at a speed of 24 km/h. How long will 07 Feb 2026, 03:37
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This is a classic distance-speed-time problem where the key is recognizing what distance the train actually covers.

Here's the breakdown:

Step 1: Understand the total distance
When a train crosses a bridge, it has to cover both the length of the bridge and its own length. Picture it: the train starts crossing when the front enters the bridge, and finishes when the back end exits. So total distance = 300m (bridge) + 120m (train) = 420 meters.

Step 2: Convert the speed to consistent units
Speed is given as 24 km/h, but we're working with meters. Convert it:
24 km/h = 24 × (5/18) = 20/3 meters per second ≈ 6.67 m/s

Step 3: Apply the time formula
Time = Distance ÷ Speed
Time = 420 ÷ (20/3) = 420 × (3/20) = 63 seconds

Common trap: Students often forget to add the train's own length and just divide 300m by the speed. That would give you 45 seconds—but that's only the time for a single point on the train to cross, not the entire train.

Takeaway: Whenever a train crosses any object (bridge, tunnel, platform, another train), always account for the train's full length in your distance calculation.

The answer is B. 63 seconds.

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