Question

A train of length $50m$ is moving with a constant speed of $10m/s$. Calculate the time taken by the train to cross an electric pole and a bridge of length $250m$.

Answer 1

Given that,

Length of train $l=50m$

Speed $v=10m/s$

Length of bridge $l_2=250m$

Now, total distance is

$D=50+250$

$D=300m$

Now, time

$v=\frac{D}{t}$

$t=\frac{D}{v}$

$t=\frac{300}{10}$

$t=30s$

Now, to cross the bridge pole

Distance is

$D=250-50$

$D=200m$

Now, the time taken to cross pole is

$V=\frac{D}{t}$

$t=\frac{D}{v}$

$t=\frac{200}{10}$

$t=20s$

Hence, the time is $30s$ and $20s$