Acar travels an average speed of 45 mph. how many hours would it take to travel 540 miles?

It would take it 12 hours. You would divide 540 by 45.

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.