The length of the bridge, which a train 135 m long and traveling at 45 km/hr can cross in 30 sec is? Choose one.
A) 235  B) 240  C) 245  D) 250  E) 255
Speed = 45 * 5/18 = 25/2 m/sec.   Time = 30 sec   Let the length of bridge be x meters.   Then, (135 + x)/30 = 25/2   x = 240 m.   Answer: Option 240
<result>B</result>
The length of the bridge, which a train 135 m long and traveling at 45 km/hr can cross in 30 sec is?