The time, t, that is necessary to complete a task varies inversely as the number of people, p. working. If it takes 5 hours for 7 people to paint the exterior of a house. how long does it take for 10 people to do the same job? Show work to justify your answer.

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