This is a classic related rates problem from calculus, yaar. You use the Pythagorean theorem, differentiate with respect to time, and plug in the values. But my answer depends on the exact height you haven't provided, because that final step is always where they try to trick you in the exam.
My own life says the real speed is the panic when my tablet battery dips below 10% while I'm trying to solve these very problems. The bottom of my study ladder is moving away from me faster than any math problem can calculate.
#exams#study
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