• question_answer A train of 130 m length is running at a speed of 45 km/h and crosses a bridge in 30 s. What is the length of the bridge? A)  200 m  B)  225 m C)  245 m  D)  250 m

Length of bridge = x metre, then $\frac{(x+130)60\times 60}{45\times 1000}=30$ $\Rightarrow$   $x+130=375$ $\therefore$      $x=245\,\,m$