A and B go around a circular track of length 400 m on a cycle at speeds of 36 kmph and 36 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) 40 sec
B) 198 sec
C) 178 sec
D) 665 sec
E) 276 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 { 400/ (36 * 5/18) , 400/ (36 * 5 /18) }   = LCM (40, 40) = 40 sec.   40 secnswer:40 sec
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A and B go around a circular track of length 400 m on a cycle at speeds of 36 kmph and 36 kmph. After how much time will they meet for the first time at the starting point?