Two persons start running simultaneously around a circular track of length 250 m from the same point at speeds of 20 kmph and 40 kmph. When will they meet for the first time any where on the track if they
are moving in the opposite direction ? Options:
A) 144  B) 15  C) 18  D) 32  E) 38
Time taken to meet the first time = length of track/relative speed   = 250/ (20 +40) (5/18)   = 250/60 *(18/5)= 
<gadget id="calculator">250/60 *(18/5)</gadget>
<output>15</output>
15 sec.   Answer : 15
<result>B</result>
Two persons start running simultaneously around a circular track of length 250 m from the same point at speeds of 20 kmph and 40 kmph. When will they meet for the first time any where on the track if they
are moving in the opposite direction ?