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Here is a link to the question:Question on Rate of Change?

The breadth of a rectangle is 1/4 of its length. Calculate the rate of increase of the area of the rectangle when its length is increasing at the rate of 0.4 cm s^-1, at the instant the length is 8 cm.

I came out with this formula : da/dt = da/dl x dl/dt

but i didn't know how to subsitute the values into the formula. Can anyone help me with this.

Answer given : 1.6 cm2 s^-1

Question on Rate of Change? - Yahoo! Answers

I have posted a link there to this topic so the OP can find my response.