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A rectangle initiolly has width 7 meters and length 5 moters and is expanding so that the area increases at a rate of 5 square meters per hour. If the width increases by 30 centimeters per hour how quickly does the length increese initially? (hint: Using the product rule, it you know any two of the derivatives you can work out the third one. Here you know $A=L_{?}$ ' $W$ and $A_{?}$ and $W_{?}$ I centimeters per hour

The area of a rectangle is given as:A=L×W..........(1)where A is the areaL is the length of the rectangleW is the width

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