How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 18 kmph?	Choose one:	A) 80 sec	B) 20 sec	C) 40 sec	D) 50 sec	E) 60 sec

Rationale: "d = 100 + 150 = 250 s = 18 * 5 / 18 = 5 mps t = 250 / 5 = 50 sec d ) 50 sec"
Answer: D