6:30
1 hour=60 minutes
60x6=360+30=390
60x3=180+40=220
390-220=170
170 divided by 60=2.83
2x60=120
170-120=50
2:50
Check:
2:50+60=3:50+60=4:50+60=5:50+40=6:30
60+60+60+40=220
Answer: To roast a food item in the oven that takes 3 hours and 40 minutes to roast and have it done and served by 6:30 p.m, you would have to start at 2:50 p.m.
Answer: 2:50 p.m.
