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How long will a 150 m long train running at a speed of 60 kmph take to cross a bridge of 300 m long?
1. 37 seconds
2. 35 seconds
3. 25 seconds
4. 27 seconds

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Correct Answer - Option 4 : 27 seconds

Given:

Length of a train is 150 m 

Speed of a train is 60km/hr

Length of a bridge is 300 m

Formula Used:

Speed = Distance/Time 

Calculation:

We know that,

km/hr × 5/18 = m/sec

⇒ 60 × 5/18 = 50/3 m/sec

Total distance to cover,

⇒ 150 + 300

⇒ 450 m

Using the formula,

⇒ 50/3 = 450/Time  

⇒ Time = (450 × 3)/50

⇒ Time = 27 sec.

∴ Time required to cross the bridge is 27 seconds.

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