The length of the bridge, which a train 120 meters long and travelling at 45 km/hr can cross in 30 seconds, is?	Choose the correct answer.
A) 328 B) 279 C) 255 D) 288 E) 211

Rationale: 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 = = > 2 ( 120 + x ) = 750 = = > x = 255 m . answer : c
Answer: C