Question

A train passes over a 400 m long bridge. If the speed of the train is 30 m/s and the train takes 20 s to cross the bridge, what is the length of the train?

Answer 1

let the length of train be x
then , distance covered by train = 400m + x
speed = 30m/s
time = 20s
so , we know that ,
speed = distance/time
distance = speed × time
d
(400+x) = 30 × 20
400+x = 600
x = 200m
length of train = 200m
hope this helps

Answer 2

Distance = Speed × Time
400 + L = 30 × 20
L = 600 - 400
L = 200 m

Length of train (L) is 200 m