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September 30, 2014

September 30, 2014

Posted by **Heidi** on Tuesday, November 2, 2010 at 4:14pm.

- Algebra -
**MathMate**, Tuesday, November 2, 2010 at 6:08pmThe rest of the fuel can last 7 hours in flight, and will leak in 12 hours.

So each hour, the plane uses 1/7th of what's left, and leaks 1/12th of what's left, for a total of 19/84th of what's left.

It will therefore last 84/19 hours.

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