Please let me know those two questions answers

30. [-/2.5 Points] DETAILS At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. The diameter of the base of the cone is approximately three times the altitude. At what rate is the height of the pile changing when the pile is 22 feet high? (Hint: The formula for the volume of a cone is V = _Jr h.) h' = ft/min 39. [-/2.5 Points] DETAILS LARCALC11 2.6.020. MY NOTES ASK YOUR TEACHER A trough is 12 feet long and 3 feet across the top (see figure). Its ends are isosceles triangles with altitudes of 3 feet. 2_ft 3 min 12 fi- 3 ft 3 ft theft (a) If water is being pumped into the trough at 2 cubic feet per minute, how fast is the water level rising when h is 1.1 feet deep? ft/min (b) If the water is rising at a rate of 3/8 inch per minute when h = 2.0, determine the rate at which water is being pumped into the trough. fts / min