Correct Answer - Option 1 : 350 m
Given:
Length of train = 150m
Speed of train = 60 km/h
Time to cross the bridge = 30 sec
Concept Used:
1 km/hr = 5/18 m/sec
Distance = Speed × Time
Calculation:
Speed of train = 60kmph = 60 × 5/18 = 50/3 m/sec
Let length of bridge be a m.
Then,
⇒ 50/3 = (a + 150)/30
⇒ 500 = a + 150
⇒ a = 350
∴ Length of bridge is 350m.
Time taken to cross a platform by a train = (length of platform + length of train)/speed of train
