A 240 m long train crosses a man walking at a speed of 4.5 km/h in the opposite direction in 12 seconds. What is the speed (in km/h) of the train?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. 67.5.
Let the speed of the train = x km/h
Relative speed = x + 4.5 km/h
⇒ (x + 4.5) × m/sec
According to the question,
Speed = Distance/Time
⇒ (x + 4.5) × =
⇒ (x + 4.5) × = 20
⇒ x + 4.5 = 72
⇒ x = 67.5