To cook ribs in the oven at 400°F, the cooking time depends on the type and size of ribs and whether they are wrapped in foil or not:

• For baby back ribs, roast them for about 50 minutes at 400°F if wrapped in foil with some apple cider vinegar to create steam

• For spareribs, roast for about 80 minutes at 400°F wrapped in foil with apple cider vinegar

• If cooking ribs without foil at 400°F, expect to cook them for about 2 to 2.5 hours, turning and basting every 30 minutes to keep them moist

• Another guideline is to cook ribs for about 30 minutes per pound at 400°F, so a 3-pound rack would take about 90 minutes, with an additional 10-15 minutes if you want them extra tender

After the initial cooking time, you can open the foil or remove ribs from the oven to apply BBQ sauce and then roast for an additional 10-15 minutes uncovered to caramelize the sauce

. In summary, at 400°F:

• Baby back ribs wrapped in foil: about 50 minutes
• Spareribs wrapped in foil: about 80 minutes
• Ribs without foil: 2 to 2.5 hours (or 30 minutes per pound)
• Finish by applying sauce and roasting uncovered for 10-15 minutes for best flavor and tenderness