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The question is not quite clear but let the width be x:-

So: 3x+2 = 20 and so x = 6

Area of rectangle then is: 6 times 20 - 120 square feet

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7y ago
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7y ago

It increases at 80 feet per second.

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Q: The length of a rectangle is thrice its width. If the width increases at 2 fts how fast is the area increases when length is 20 ft?
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