Question

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has
traveled another 5 miles and is going 500 mph. At that moment, how fast is the distance between the train and the plane increasing?


Is the answer 5.65 miles away.

Answers

Reiny
Something is not right with this question.
Your train is going 500 mph ?????

I think you want that to be the speed of the plane. How fast is the train going?

your answer is a "distance", it asked "how fast is the distance between them increasing" which is velocity.

Please check the wording of this great Calculus question.

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