# Math Help - Help with calc 1 problem: rate of change.

1. ## Help with calc 1 problem: rate of change.

I need help with this problem. Could someone show me how to get the correct answer. I get a wrong answer every time.

A point P is moving along the curve whose equation is y=√x. Suppose that x is increasing
at the rate of 40 units/s when x=3. How fast is the distance between p and the point (2,0) changing\
at that instant?

Thanks so much

2. Originally Posted by algar32
I need help with this problem. Could someone show me how to get the correct answer. I get a wrong answer every time.

A point P is moving along the cruve whose equation is y=√x. Suppose that x is increasing
at the rate of 40 units/s when x=3. How fast is the distance between p and the point (2,0) changing\
at that instant?