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The height, width and length of a closed rectangular box are changing by 1m/s,2m/s and 1m/s...

The height, width and length of a closed rectangular box are changing by 1m/s,2m/s and 1m/s respectively. find the rates of change of a) volume and b)surface area of the box when the height, width and length are 4m, 3m and 2m respectively.

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