Two trains of length 120 m and 210 m are 80 m apart. They start moving towards each other on parallel tracks, at speeds 69 kmph and 82 kmph. After how much time will the trains meet?	Choose one: A) 15/10 B) 19/10 C) 20/19 D) 16/10 E) 27/10
They are moving in opposite directions, relative speed is equal to the sum of their speeds.   Relative speed = (69 + 82)*5/18 =41.9 mps.   The time required = d/s = 80/41.9 = 19/10 sec.   Answer:19/10
<result>B</result>
Two trains of length 120 m and 210 m are 80 m apart. They start moving towards each other on parallel tracks, at speeds 69 kmph and 82 kmph. After how much time will the trains meet?