The length of a train and that of a platform are equal. If with a speed of 54 k/hr, the train crosses the platform in one minute, then the length of the train (in meters) is?
Choose one.
A) 227  B) 299  C) 450  D) 750  E) 211

Rationale: "speed = [ 54 * 5 / 18 ] m / sec = 15 m / sec ; time = 1 min . = 60 sec . let the length of the train and that of the platform be x meters . then , 2 x / 60 = 15 è x = 15 * 60 / 2 = 450 answer : c"
Answer: C