The length of the bridge, which a train 130 metres long and travelling at 45 km / hr can cross in 30 seconds, is	Answers:
A) 200 m  B) 225 m  C) 245 m  D) 250 m  E) none

Rationale: "sol . speed = [ 45 x 5 / 18 ] m / sec = ( 25 / 2 ) m / sec ; time = 30 sec . let the length of bridge be x metres . then , 130 + x / 30 = 25 / 2 ⇔ 2 ( 130 + x ) = 750 ⇔ x = 245 m . answer c"
Answer: C