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24 December, 01:30

A 15-ft ladder is leaning against one wall of an alley 9 ft wide. the ladder slips, its top sliding down the wall, its foot sliding across the alley and striking the opposite wall at a speed of 4 ft/sec. How fast is the top of the ladder falling at that instance?

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  1. 24 December, 01:50
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    2x dx/dt + 2y dy/dt = 0

    x dx/dt + y dy/dt = 0

    9*4 + 12 dy/dt = 0

    dy/dt = - 3 ft/sec
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