The length of the bridge, which a train 160 meters long and travelling at 45 km/hr can cross in 30 seconds, is:  Choose the correct choice from the following answers
A) 230 B) 244 C) 245 D) 215 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 , ( 160 + x ) / 30 = 25 / 2 = = > 2 ( 160 + x ) = 750 = = > x = 215 m . answer : option d"
Answer: D