Two trains of length 160 m and 200 m are 100 m apart. They start moving towards each other on parallel tracks, at speeds 54 kmph and 72 kmph. In how much time will the trains cross each other?
Choose the correct option
A) 100/7 sec
B) 80/7 sec
C) 112/7 sec
D) 120/7 sec
E) 50/7 sec
Relative speed = (54 + 72)* 5/18 = 7 * 5= 
<gadget id="calculator">7 * 5</gadget>
<output>35</output>
35 mps.   The time required= d/s = (160 + 100 + 300)/35   = 560/35 = 112/7 sec.   ANSWER:112/7 sec
<result>C</result>
Two trains of length 160 m and 200 m are 100 m apart. They start moving towards each other on parallel tracks, at speeds 54 kmph and 72 kmph. In how much time will the trains cross each other?