At a speed of 50 miles per hour, a certain car uses 1 gallon of gasoline every 30 miles.If the car starts with a full 12 gallon tank of gasoline and travels for 5 hours at 50 miles per hour, the amount of gasoline used would be what fraction of a full tank?
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A3/25
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B11/36
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C7/12
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D2/3
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E25/36