Question

an electric train is moving with a velocity of 120 km/h .How much distance will it move in 30 s

Answer 1

velocity/speed=120km/hr
speed=distance /time
distance=speed*time
time=30sec=30/3600hr
distance=120*30/3600=1 km
hope it helps!!

Answer 2

120km/h
$= 120 \times \frac{5}{18} \\ = 33.333333333................$
So, Speed is 33.3m/s
Time is 30 seconds
$distance = speed \times time \\ = 33.3 \times 30 \\ = 999$
So, Distance travelled with the speed of 33.3m/s in 30 seconds is 999m.