The length of the bridge, which a train 140 metres long and travelling at 45 km/hr can cross in 30 seconds, is?
Pick:  A) 255  B) 267  C) 235  D) 277  E) 211

Rationale: "speed = [ 45 x 5 / 18 ] m / sec = [ 25 / 2 ] m / sec time = 30 sec let the length of bridge be x metres . then , ( 140 + x ) / 30 = 25 / 2 = > 2 ( 140 + x ) = 750 = > x = 235 m . answer : c"
Answer: C