The length of the bridge, which a train 150 meters long and travelling at 45 km/hr can cross in 30 seconds, is:	Choose the most appropriate option.
A) 230	B) 225	C) 245	D) 238	E) 236

Rationale: "speed = ( 45 * 5 / 18 ) m / sec = ( 25 / 2 ) m / sec . time = 30 sec . let the length of bridge be x meters . then , ( 150 + x ) / 30 = 25 / 2 = = > 2 ( 150 + x ) = 750 = = > x = 225 m . answer : option b"
Answer: B