Question

a train is travelling at a speed of 108 km/hr. how much distance it is travelling every second?

Answer 1

The velocity(speed) of the train is $108km/hour$.
We should expand "1 hour"

$1 hour=60minutes$
$60minutes=60seconds$
$(60*60 )= 3600$
$1hour=3600seconds$

So we conclude that $1second= \frac{1}{3600} hours$
Do what we always need to do to find a fourth value. Do the proportions.

$1:v:3600:108$
$1*108=108$
$\frac{108}{3600} = 0.03$

Therefore, the train is going at $0.03km/second$

Answer 2

108$\frac{Km}{hr} = \frac{108 \times1000\ m}{60 \times 60\ secs} = \frac{108 \times 1000}{3600 } \frac{m}{sec} = 30$ metres in one second