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I am doing a question on related rates that I have become stuck on.

**The height (h) of an equilateral triangle is increasing at a rate of 3cm/min. How fast is the area changing when h is 5cm?**

I know that the area of a triangle is bh/2, but after that I am stuck I tried deriving it using the chain rule so that I could substitute h and the rate of h, but I don't think that i was doing it the right way. If anyone could direct me here I would really appreciate the help.