• # question_answer A train 100m long passes a bridge at the rate of 72 km/h per hour in 25 seconds. The length of the bridge is: A)  150 m  B)  400 m C)  300 m  D)  200 m

[b] Let the length of the bridge be x m. Now, $(x+100)=72\times 25\times \frac{5}{18}=500$ $\Rightarrow$ $x=500-100=400\,m$