Each group contained 25 cattails. All of the groups were grown in the same type of soil, they all received the same amount of light, and they were all kept at the same
Cooking at a constant oven temperature of 300Â°F (160Â°C), a 5- to 8-lb standing rib roast will take 17-19 minutes per pound for rare, 20-22 for medium rare, 23-25 minutes for medium, and 27-30 minutes for well done.ow long and at what temperature should I cook a beef roast in the oven? Roasting is a great cooking method for a large, tender cut of beef  such as a rib or sirloin roast.
Serves 4 to 8 people depending on the size of the roast. Note: For medium-rare prime rib, we want to take the roast out of the oven at 120Â°F, and it will continue cooking until it reaches 130Â°F. If you prefer a medium prime rib, take it out at 130Â°F with a target temperature of around 140Â°. Roast for 20 minutes, then lower the heat to 325Â°F and roast until the meat's internal temperature reaches 120Â°F, which will be another hour to three and a half hours, depending on the size of your roast.