Question

A train of length 95 m running at speed of 126 kmph crosses a bridge of 150 m in length. Calculate total time taken to cross the bridge.
1. 5 seconds
2. 7 seconds
3. 10 seconds
4. 13 seconds

Answer 1

Correct Answer - Option 2 : 7 seconds

Given:

Length of train = 95 m

Speed of train = 126 km/ h

Length of bridge = 150 m

Formula used:

Speed = Distance/ Time

m/ s = 5/ 18 km/hr

Speed of train = (Length of train + length of bridge)/ Time

Calculation:

Speed of train = 126 × 5/ 18

⇒ Speed of train = 35 m/ s

Speed of train = (95 + 150)/ time

⇒ Time taken = 245/ 35

⇒ Time taken = 7 seconds

∴ Time taken to cross the bridge is 7 seconds