SOLUTION: I just need to know what kind of formula I need to solve a problem like this: "Alex and judy are 30 miles apart on a calm lake paddling toward each other. Alex paddes and 5 miles

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Question 676208: I just need to know what kind of formula I need to solve a problem like this:
"Alex and judy are 30 miles apart on a calm lake paddling toward each other. Alex paddes and 5 miles per hour, while judy is paddling at 8 miles per hour.how long will it take them to meet?"
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The way I do it, and I think it's easier, is to
think of one of the people as standing still
and the other approaching at the sum of
their speeds. The one that's moving has to go
the entire distance between them.
+30+=+%28+5+%2B+8+%29%2At+
+30+=+13t+
+t+=+30%2F13+
+t+=+2.3076+
+.3076+%2A60+=+18.46+
It will take 2 hrs 18 and 1/2 minutes approximately