For each 70mm of coloured fabric Alex uses to make his curtains, he also uses 20cm of white fabric. Express the amount of white fabric to coloured fabric as a ratio in its simplest form.

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min