A train that moves at 240 km/hr will travel x meters in 30 seconds.
$$\\\frac{240km}{1hour}\\\\ =\frac{240\div 60km}{1minute}\\\\ =\frac{4km}{1minute}\\\\ =\frac{2km}{30seconds}\\\\$$
240
/60 MINUTS =4
/ HALF MINUT =2