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Mountain climber A is at an altitude of 250 feet and is descending at a rate of 30 feet per hour. Mountain climber B is at an altitude of 400 feet and is descending at a rate of 50 feet per hour. In how many hours will the altitude of mountain climber b be lower than the altitude of mountain climber a

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texaschic101
250 - 30h > 400 - 50h
-30h + 50h > 400 - 250
20h > 150
h > 150/20
h > 7.5........any number above 7.5 hrs....because 7.5 hrs puts them at the same altitude

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