Crazy, Cranky Candles

Team: 
The Problematic Panthers
Topic: Algebraic Expressions & Equations
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One candle burns entirely in 6 hours, and another burns entirely in 9 hours. The candles were lit at the same time, and they were the same height when lit. After how many hours will one candle be half the height of the other? Express your answer as a decimal to the nearest tenth

Common Core Standards: A-CED.1
Problem #: 
269 (2011-2012)
Problem Difficulty Level: 5 [?]