If a 4-pound roast takes 150 minutes to cook, how long should a 5-pound roast take?
Just like your last question
4 pounds / 150 min = 5 pounds / x minutes
so
5 * 150 = 4 * x
x = 187.5 minutes
4 pounds / 150 min = 5 pounds / x minutes
so
5 * 150 = 4 * x
x = 187.5 minutes