1.

At the speed of 60 km per hour, 125 meter long train crosses a bridge in 30 seconds. What is the length of bridge?1. 375 meter2. 225 meter3. 125 meter4. 250 meter

Answer» Correct Answer - Option 1 : 375 meter

Given:

Speed of the train = 60 km/h

Length of the train = 125 m

Time to cross a bridge = 30 sec 

Concept used:

Distance = Speed × Time

km/h × 5/18 = m/sec

Calculation:

Speed of the train = 60 km/h  

⇒ 60 × 5/18 = 50/3 m/sec

Let the length of a bridge be L.

(125 + L)/(50/3) = 30

⇒ (125 + L) = (30 × 50)/3

⇒ 125 + L = 500

⇒ L = 500 – 125

⇒ L = 375

∴ The length of bridge is 375 m.



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