Two planes leave an airport at the same time, one flying east, the other flying west. The eastbound plane travels 100 mph slower. They are 3500 mi apart after 5 hr. Find the speed of each plane.

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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.

The final answer is a

You should use a calculator for this.