Two persons start running simultaneously around a circular track of length 100 m from the same point at speeds of 5 km/hr and 13 km/hr. When will they meet for the first time any where on the track if they are moving in opposite directions?	Choose the correct choice:
A) 20 sec  B) 37 sec  C) 17 sec  D) 23 sec  E) 27 sec
Time taken to meet for the first time anywhere on the track   = length of the track / relative speed   = 100 / (5 + 13)5/18 = 100* 18 / 18 * 5 = 20 seconds.   20 secnswer : 20 sec
<result>A</result>
Two persons start running simultaneously around a circular track of length 100 m from the same point at speeds of 5 km/hr and 13 km/hr. When will they meet for the first time any where on the track if they are moving in opposite directions?