Two trains of length 100 m and 220 m are running towards each other on parallel lines at 42 kmph and 30 kmph respectively. In what time will they be clear of each other from the moment they meet?	Select.
A) 18 sec  B) 70 sec  C) 21 sec  D) 20 sec  E) 16 sec
Relative speed = (42 + 30) * 5/18 = 4 * 5= 
<gadget id="calculator">4 * 5</gadget>
<output>20</output>
20 mps.   Distance covered in passing each other= 100 + 220= 
<gadget id="calculator">100 + 220</gadget>
<output>320</output>
320 m.   The time required= d/s   = 320/20= 
<gadget id="calculator">320/20</gadget>
<output>16</output>
16 sec.   Answer: 16 sec
<result>E</result>
Two trains of length 100 m and 220 m are running towards each other on parallel lines at 42 kmph and 30 kmph respectively. In what time will they be clear of each other from the moment they meet?