Two persons start running simultaneously around a circular track of length 400 m from the same point at speeds of 20 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 ?  Options.
A) 27 sec	B) 87 sec	C) 67 sec	D) 47 sec	E) 36 sec
Explanation:   Time taken to meet for the first time anywhere on the track   = length of the track / relative speed   = 400 / (20 + 20)5/18 = 400 x 18 / 40 x 5 = 36 seconds.   Answer: 36 sec
<result>E</result>
Two persons start running simultaneously around a circular track of length 400 m from the same point at speeds of 20 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 ?