Answer:
Quinn
For Quinn:
275 points - - > 5 min
5000 points - - > x min
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275*x=5*5000-->x=90.9 minutes
For Delilah:
675 points - - > 15 min
5000 points - - > y min
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675*x=15*5000-->y=111.1 minutes
90.9<111.1, so Quinn will score 5000 points faster