Question

A train 400 m long is running at a speed of 72 km/hr how much time does it take to cross a telegraph post?

Answer 1

distance=400m
speed=20m/s
time=distance/speed
=400/20
=20seconds

Answer 2

hello there!!!

Speed of the train = 72 km/hr = 20 m/ s
length of the train = distance covered by the train = 400m
As we know that Speed = distance/ time
time = distance/ speed
t = 400 / 20 = 20 sec

hope it helps you