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Mathematics 9 Online
OpenStudy (anonymous):

After opening her parachute, the smokejumper floats to the ground at a constant rate. After floating for 10 seconds, the smokejumper is 1800 feet above the ground. After floating for 30 seconds, she is 1400 feet above the ground. What is the total number of seconds that the smokejumper floats in the air before landing on the ground?

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