The length of the bridge, which a train 100 metres long and travelling at 45 km/hr can cross in 30 seconds, is:	Select the correct option:	A) 230	B) 240	C) 245	D) 250	E) 275

Rationale: "speed = [ 45 x 5 / 18 ] m / sec = [ 25 / 2 ] m / sec time = 30 sec let the length of bridge be x metres . then , ( 100 + x ) / 30 = 25 / 2 = > 2 ( 100 + x ) = 750 = > x = 275 m . answer : option e"
Answer: E