Two trains of length 100 m and 200 m are 250 m apart. They start moving towards each other on parallel tracks, at speeds 54 kmph and 72 kmph. After how much time will the trains meet?	Pick
A) 50/7 sec B) 32/3 sec C) 20/7 sec D) 32/3 sec E) 53/2 sec
They are moving in opposite directions, relative speed is equal to the sum of their speeds.   Relative speed = (54 + 72)*5/18 = 7*5= 
<gadget id="calculator">7*5</gadget>
<output>35</output>
35 mps.   The time required= d/s = 250/35 = 50/7 sec.   50/7 secnswer:50/7 sec
<result>A</result>
Two trains of length 100 m and 200 m are 250 m apart. They start moving towards each other on parallel tracks, at speeds 54 kmph and 72 kmph. After how much time will the trains meet?