Two persons start running simultaneously around a circular track of length 400 m from the same point at speeds of 15 kmph and 25 kmph. When will they meet for the first time any where on the track if they are moving in the opposite direction ? Choose the correct answer: A) 144 B) 36 C) 124 D) 32 E) 38
Time taken to meet the first time = length of track/relative speed   = 400/ (15 +25) (5/18)   = 400/40 *(18/5)= 
<gadget id="calculator">400/40 *(18/5)</gadget>
<output>36</output>
36 sec.   ANSWER:36
<result>B</result>
Two persons start running simultaneously around a circular track of length 400 m from the same point at speeds of 15 kmph and 25 kmph. When will they meet for the first time any where on the track if they are moving in the opposite direction ?