Two trains of length 100 m and 200 m are 100 m apart. They start moving towards each other on parallel tracks, at speeds 90 kmph and 108 kmph. In how much time will the trains cross each other?  Choose the correct option:	A) 80/8	B) 80/7	C) 80/5	D) 80/3	E) 80/11
Relative speed = (90 + 108)* 5/18 = 11 * 5= 
<gadget id="calculator">11 * 5</gadget>
<output>55</output>
55 mps.   The time required= d/s = (100 + 100 + 200)/55   = 400/55 = 80/11 sec.   Answer: 80/11
<result>E</result>
Two trains of length 100 m and 200 m are 100 m apart. They start moving towards each other on parallel tracks, at speeds 90 kmph and 108 kmph. In how much time will the trains cross each other?