12 inch candle and 18 inch candle lit at 6 pm . 12 inch candle burns 0.5 inch every hour . 18 inch candle burn 2 inch every hour
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When you say "which," it sounds like it should be multiple choice. Anyways, here's the simplified form of 
(When simplifying fractions, you should <em>never</em> have a square root on the bottom. Multiply by the square root to cancel it out)
(When simplifying fractions, you should <em>never</em> have a square root on the bottom. Multiply by the square root to cancel it out)