Two trains of same length are running on parallel tracks in opposite directions with speeds of 54 km/h and 90 km/h respectively. They cross each other in 12 sec. Find the length (in metres) of each train.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 240.
Given:
Speed of first train = 54 km/h
Speed of second train = 90 km/h
Time = 12 sec
Formula Used:
Relative speed in opposite direction = S1 + S2
Speed (m/s) = Speed (km/h) × 5/18
Speed = Distance/Time
Explanation:
Let's assume the length of each train is x.
Relative speed = 54 + 90
⇒ 144 km/h
⇒ = 40 m/s
According to the question,
⇒ 12 = (x + x)/40
⇒ 12 = 2x/40
⇒ x = 480/2 = 240 m
The length of each train, x = 240m