HW13: Problem 3 Previous Problem List Next Results for this submission Entered A

Question

HW13: Problem 3 Previous Problem List Next Results for this submission Entered Answer Preview Result 138 138 incorrect The answer above is NOT correct. (1 point) Two trains leave stations 250 miles apart on parallel tracks one hundred feet apart (the first track is one hundred feet north of the second track). The trains travel toward each other, one going East, the other West, and each traveling at 69 miles per hour. How fast is the distance between the trains changing just as they pass each other? The distance between the trains is changing at a rate of 138 i miles per hour.

Explanation / Answer

When the trains are approaching each other the distance between them is decreasing. After they pass, it increases again. At the moment of passing, the distance between them is one hundred feet, and is neither increasing or decreasing.

the distance between the trains changing rate=-(69+69)=-138 miles/hour

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