A and B go around a circular track of length 600 m on a cycle at speeds of 24 kmph and 60 kmph. After how much time will they meet for the first time at the starting point?  Choose the most appropriate option:
A) 120 sec
B) 176 sec
C) 178 sec
D) 180 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/ (24 * 5/18) , 600/ (60 * 5 /18) }   =180 sec.   Answer: 180 sec
<result>D</result>
A and B go around a circular track of length 600 m on a cycle at speeds of 24 kmph and 60 kmph. After how much time will they meet for the first time at the starting point?