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A 480 metres long train is running at the speed of 36 km/hr. If it crosses a bridge in 64 seconds, then what is the length of the bridge ?
1. 240 metres
2. 320 metres
3. 160 metres
4. 140 metres

1 Answer

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Correct Answer - Option 3 : 160 metres

Given 

Length of first train = 480 meters 

Speed of train = 36 km/hr 

Formula Used 

Distance = Time × Speed 

Calculation 

Let the length of bridge be x 

Distance = length of train + length of bridge

⇒ x + 480 = 36 ×(5/18) × 64 

⇒ x = 640 - 480 = 160 metres

∴ The length of bridge is 160 metres

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