The height of a rectangular box is increasing at a rate (2m/s) while the volume is decreasing at a rate of (5m elevation cubed/s). The base of the box is a square and k is the rate at which one of the sides of the base is decreasing at the moment when the area of ​​the square is (64m squared) and the box height is 8m. Find the value of 64 multiplied k.

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