Two trains are moving at 80 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?
Select the correct option:
A) 6 sec B) 7 sec C) 7 2 / 2 sec D) 8 sec E) 9 sec

Rationale: 70 + 80 = 150 * 5 / 18 = 125 / 3 mps d = 150 + 100 = 250 m t = 250 * 3 / 125 = 6 sec answer : a
Answer: A