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A model car is built using a 1 to4 scale on the 3 point 6 inches determine actual length of car?

If the model car uses a 1 to 4 scale, that means 1 inch on the model represents 4 inches in real life.

The model car is 3.6 inches long. Therefore, the actual length of the car is 3.6 inches * 4 = $\boxed{14.4}$ inches.