Question

The length of the bridge, which a train $130$ metres long and travelling at $54$ km/hr can cross in $30$ seconds, is

• A. $220$ metres
• B. $320$ metres
• C. $350$ metres
• D. $225$ metres

Answer 1

The correct option is B $320$ metres

Speed of train $=54\times \frac{5}{18}=15$ m/s
Time taken $=30$ sec
Let the length of the bridge be $x$ metres.
Then, $\frac{130+x}{30}=15$
$\Rightarrow 130+x=450$
$\Rightarrow x=320$ m