The length of the bridge, which a train 145 m long and traveling at 45 km/hr can cross in 30 sec is?
Choices: A) 230 B) 240 C) 245 D) 250 E) 255

Rationale: "speed = 45 * 5 / 18 = 25 / 2 m / sec . time = 30 sec let the length of bridge be x meters . then , ( 145 + x ) / 30 = 25 / 2 x = 230 m . answer : option a"
Answer: A