Two trains each 170m in length each, are running on two parallel lines in opposite directions. If one goes at the speed of 55km/h while the other travels at 50km/h. how long will it take for them to pass each other completely.
Select the correct option:
A) 15 sec	B) 11.6 sec	C) 31.6 sec	D) 12.6 sec	E) 23 sec

Rationale: explanation : d = 170 m + 170 m = 340 m rs = 55 + 50 = 105 * 5 / 18 = 146 / 5 t = 340 * 5 / 146 = 11.6 sec answer : option b
Answer: B