H.C.F and L.C.M of Numbers (Quiz)

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Q.1 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 meet again at the starting point ?
  26 minutes 18 seconds
  42 minutes 36 seconds
  45 minutes
  46 minutes 12 seconds