Question

With a speed of 48 km/h , a train crosses a signal I n 21 seconds .Find the length of the train .(with statement)

Answer 1

To convert speed in kmph to m/s multiply it by 5/18
So,
48 kmph = 48 × 5/18 m/s = 40/3 m/s

Distance = Speed × Time
= (40/3 m/s) × (21 s)
= 280 m

Length of the train is 280 m

Answer 2

speed of train = 48km/hr
it crosses a signal in 21 seconds

so, 48*5/21= 1440/7
205.71m ans.