A train 555 meters long crosses a man walking in the opposite direction at a speed of 3.4 km/h in 9 seconds. What is the speed of the train (in km/h)?

For example, the train problem would be written like this:

Distance covered = train length = 555 m
Time = 9 sec

Relative speed = $555/9 = 61.67$ m/s

Convert into km/h:
$61.67 \times \frac{18}{5} = 222.1$ km/h

Man’s speed = 3.4 km/h

Train speed = $222.1 - 3.4 = 218.7$ km/h

$\therefore$ Correct Answer: 218.6 km/h ✅