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A train 130 m long crosses a 110 m long bridge in 7.5 seconds. What is the speed of the train in km/h?


1. 115.2 km/h
2. 110.5 km/h
3. 120 km/h
4. 125 km/h

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Correct Answer - Option 1 : 115.2 km/h

Given:

Length of train = 130 m

Length of bridge = 110 m

Time taken to cross to bridge = 7.5 seconds

Concept:

The length calculated to cross the bridge is the length of the train and the bridge added together.

Formula used:

Speed = Distance/Time

Conversion from m/s to km/h = Multiply with 18/5

Calculation:

The total distance travelled by the train = 130 m + 110 m

⇒ 240 m

Speed of the train while crossing the bridge = 240/7.5 m/s

⇒ 32 m/s

Speed of the train in km/h = {32 × (18/5)} km/h

⇒ 115.2 km/h

∴ The speed of the train is 115.2 km/h.

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