Every 4 minutes you get 8 yards
60min/4 min= 15 times
15x8 yards= 120 yards of fabric
I hope that makes sense but that’s how I do it in my head. You just have to find out how many times 4 min of fabric making can go into 60 min and then multiply the amount of yards it makes in 4 min by however many times and there’s your answer.