A and B go around a circular track of length 600 m on a cycle at speeds of 30 kmph and 54 kmph. After how much time will they meet for the first time at the starting point?
Select: A) 120 sec B) 360 sec C) 178 sec D) 187 sec E) 189 sec
Time taken to meet for the first time at the starting point   = LCM { length of the track / speed of A , length of the track / speed of B}   = LCM { 600/ (30 * 5/18) , 600/ (54 * 5 /18) }   = 360 sec.   Answer: 360 sec
<result>B</result>
A and B go around a circular track of length 600 m on a cycle at speeds of 30 kmph and 54 kmph. After how much time will they meet for the first time at the starting point?