Solve the problem.At a national computer show, two software companies continuously run videos showing their products. Company A's video repeats every 9 minutes, while Company B's video repeats every 15 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. 90 minutes
B. 15 minutes
C. 45 minutes
D. 30 minutes
Answer: C
Mathematics
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