Two trains of length 120 m and 280 m are running towards each other on parallel lines at 32 kmph and 30 kmph respectively. In what time will they be clear of each other from the moment they meet?
Select
A) 33 1/5 sec  B) 23 1/5 sec  C) 24 1/5 sec  D) 23 3/5 sec  E) 20 1/5 sec
Relative speed = (32 + 30) * 5/18 = 4 * 5 = 17.22 mps.   Distance covered in passing each other = 120 + 280= 
<gadget id="calculator">120 + 280</gadget>
<output>400</output>
400 m.   The time required= d/s = 400/20 = 23 1/5 sec.   ANSWER:23 1/5 sec
<result>B</result>
Two trains of length 120 m and 280 m are running towards each other on parallel lines at 32 kmph and 30 kmph respectively. In what time will they be clear of each other from the moment they meet?