A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and c in 198 seconds, all starting at the same point. After what time will they again at the starting point ?

A. 26 minutes and 18 seconds
B. 42 minutes and 36 seconds
C. 45 minutes
D. 46 minutes and 12 seconds

• D. 46 minutes and 12 seconds
  
  By taking L.C.M. of 252, 308 and 198 = 2772.
  
  So, A, B and C will again meet at the starting point in 2772 seconds.
  
  So, 2772/60 = 46.2 minutes.
  
  In other words, 46 min. 12 sec.
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