Two trains of length 120 m and 280 m are running towards each other on parallel lines at 42 kmph and 36 kmph respectively. In what time will they be clear of each other from the moment they meet? Pick one:  A) 18.4 sec  B) 77 sec  C) 76 sec  D) 20 sec  E) 66 sec

Rationale: "relative speed = ( 42 + 36 ) * 5 / 18 = 21.7 mps . distance covered in passing each other = 120 + 280 = 400 m . the time required = d / s = 400 / 21.7 = 18.4 sec . answer : a"
Answer: A