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1 For a medium rare roast: Cook the roast for 20 minutes for every pound. 2  If you were cooking a 5 pound roast, you would cook it for 100 minutes. 3  For a medium roast: Allow 22 minutes of cooking time for every pound.
Check out recipetips.com on Beef Cooking Times. I can give the time and temp for tip round roast beef: Round tip roast 325Â°F for 3-4 lbs for rare is 28-30 min, for med rare is 30-35min, for medium is 38-45 min, for med well is 45-48 min, and for well is 48-50 min.Source(s): recipetips.com and beef cooking times.est Answer: In a preheated 300 degree oven..about 25 minutes per pound for medium..30 minutes for well done. assuming the roast is room temperature or close when put in. if you have a meat thermometer you want 150 degrees in the center for medium or 160 for well. Source(s): BIKER DUDE Â· 7 years ago.