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Homework Statement
A man is walking at the rate of 6.5km/h towards the foot of a tower 120m high.At what rate is he approaching the top of the tower when he is 50m away from the bottom of the tower?
Homework Equations
Nah
The Attempt at a Solution
##6.5km/h = 1\frac{29}{36}m/s##
I know how to find the derivative of many functions but I don't know how to apply it here.Any hint?
*Note: I haven't officially taken a calculus course. I am self learning it. So please bear with me