Two persons start running simultaneously around a circular track of length 300 m from the same point at speeds of 10 km/hr and 20 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) 27 sec
B) 87 sec
C) 67 sec
D) 36 sec
E) 46 sec
Explanation:   Time taken to meet for the first time anywhere on the track   = length of the track / relative speed   = 300 / (10 + 20)5/18 = 300 x 18 / 30 x 5 = 36 seconds.   Answer: 36 sec
<result>D</result>
Two persons start running simultaneously around a circular track of length 300 m from the same point at speeds of 10 km/hr and 20 km/hr. When will they meet for the first time any where on the track if they are moving in opposite directions ?