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