How many words they have already typed is their starting/ y intercept. Their words per minute is their rate. We need their equations to equal themselves so we can find when they are the same. X will be the amount of minutes and we need X by itself.
180+30x=60+50x
Now let’s subtract 60 from each side.
120+30x=50x
Let’s subtract 30x from each side.
120=20x
Let’s divide each side by 20.
6=x
It will take 6 minutes for Millie to catch up with Ben.