CALE - PY 7. A point moves along the curve xy = 20, x > 0, so that the x-coordinate is increasing constantly at a rate of 5 units per second. At what rate is the y-coordinate changing at the point (2, 10)? [2 marks ] notlogylb evhleag ani giveme 2. Sand is being dumped from a conveyor belt at a rate of 1.2 m'/min and forms a pile in the shape of a cone whose base radius is always twice its height. (V = 3 mrsh) How fast is the height of the pile increasing at the instant when 2881 m' of sand has been dumped? (Answer to the nearest mm/min) [ 4 marks ]