how long does it take to cook a pork roast at 350?
['Preheat oven to 350°F.', 'Mix together black pepper, garlic powder and salt. ... ', 'Put the roast on a rack in a roasting pan. ... ', 'Roast until internal temperature is between 145-160°F, 20-25 minutes per pound. ... ', 'Cover roasting pan with foil and let rest for 30 minutes.', 'Heat oven to 475°F. ... ', 'Carve and serve immediately.']