A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

Given Data

• Train length = 360 m
• Bridge length = 140 m
• Speed = 45 km/hr
• Required: time to pass the bridge

Step 1: Total distanceDistance = 360 + 140 = 500 m

Step 2: Convert speed to m/s45 km/hr = 45 × (5/18) = 12.5 m/s

Step 3: Time = distance ÷ speedt = 500 ÷ 12.5 = 40 s

Checks & Common Pitfalls

• Add lengths when crossing a bridge.
• Use km/hr to m/s conversion × 5/18.

Final AnswerThe train will pass the bridge in 40 s.