The length of the bridge, which a train 120 meters long and travelling at 45 km/hr can cross in 30 seconds, is? Choose one
A) 328
B) 279
C) 255
D) 288
E) 211
Speed = (45 * 5/18) m/sec = (25/2) m/sec. Time = 30 sec. Let the length of bridge be x meters. Then, (120 + X)/30 = 25/2 ==&gt; 2(120 + X) = 750 ==&gt; X = 255 m.Answer: 255
<result>C</result>
The length of the bridge, which a train 120 meters long and travelling at 45 km/hr can cross in 30 seconds, is?