A and B go around a circular track of length 600 m on a cycle at speeds of 36 kmph and 60 kmph. After how much time will they meet for the first time at the starting point? Choose the correct choice from the following answers:
A) 120 sec B) 176 sec C) 178 sec D) 187 sec E) 180 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/ (36 * 5/18) , 600/ (60 * 5 /18) }   = 180 sec.   Answer: 180 sec
<result>E</result>
A and B go around a circular track of length 600 m on a cycle at speeds of 36 kmph and 60 kmph. After how much time will they meet for the first time at the starting point?