First find the total time Mary's trip takes: 630 feet / 90 feet/minute = <<630/90=7>>7 minutes
Then find the total time Ann's trip takes: 800 feet / 40 feet/minute = <<800/40=20>>20 minutes
Then subtract Mary's time from Ann's time to find the difference: 20 minutes - 7 minutes = <<20-7=13>>13 minutes
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