C Fig.1 12. Three babies A, B and C cry out at every interval of time. Baby A cries out at every 20 minutes, while B cries out at every 30 minutes and C at every 40 minutes. If they are observed at the same time, after what time will the three of them cry together? A. After 20 minutes C. After 40 minutes B. After 30 minutes D. After 120 minutes 2015 3

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