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.
