SOLUTION: One bus leaves a stop every 12 minutes. A second bus leaves the same stop every 18 minutes. If they both leave at 3:20p.m. at what time will they next leave together?

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Question 900117: One bus leaves a stop every 12 minutes. A second bus leaves the same stop every 18 minutes. If they both leave at 3:20p.m. at what time will they next leave together?
Found 2 solutions by richwmiller, josmiceli:
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
3*12=36
2*18=36
Next time would be in 36 minutes or at 3:20+:36=3:56

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The 4th time that the 1st bus leaves
will be 3:20 PM plus +3%2A12+=+36+
or 3:56 PM
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The 3rd time the 2nd bus leaves
will be 3:20 PM plus +2%2A18+=+36+
or 3:56 PM
-----------
So the buses leave together at 3:56 PM