<human>:  Mary and Ann are going sledding. Mary slides down a hill that's 630 feet long at a speed of 90 feet/minute. Ann slides down a hill that's 800 feet long at a rate of 40 feet/minute. How much longer does Ann's trip take than Mary?
<bot>: How many minutes does Mary take? ** First find the total time Mary's trip takes: 630 feet / 90 feet/minute = <<630/90=7>>7 minutes
How many minutes does Ann take? ** Then find the total time Ann's trip takes: 800 feet / 40 feet/minute = <<800/40=20>>20 minutes
How much longer does Ann's trip take than Mary? ** 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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