Solve the problem.At a national computer show, two software companies continuously run videos showing their products. Company A's video repeats every 15 minutes, while Company B's video repeats every 21 minutes. If both companies begin the videos at 1:00 P.M. when the show opens, how many minutes will elapse before they are in sync again?
A. 70 minutes
B. 210 minutes
C. 105 minutes
D. 35 minutes
Answer: C
Mathematics
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