Question

A train crosses a railway platform equal to its own length in $12$ seconds. If the train was running at $36$ km per hour, calculate the length of the train

Answer 1

Speed of the train = 36 km/h
$=36\times \frac{5}{18}m/sec=10m/sec.$
Let the length of the train be x metres.
then, $\frac{x+x}{12}=10$
Hence, $2x=120$
$\therefore x=60$ metres.