Train of 200 meters long takes 18 seconds to cross a man running at 15 kmph in a direction opposite to that of the train. The speed of the train:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 25 kmph
To pass the man, the train covers its own length. As the two move in opposite directions, they close the gap at the sum of their speeds (the relative speed).
Relative speed \(\displaystyle =\frac{200}{18}=\frac{100}{9}\) m/s
In km/h: \(\displaystyle\frac{100}{9}\times\frac{18}{5}=40\) km/h
Speed of the train \(=40-15=25\) km/h