In this question, you know that the machine packs [tex]\frac{2}{3}[/tex] of a box every [tex]\frac{1}{2}[/tex] of a minute. Since it is constant, you simply have to double the half a minute to a full minute and then also double the rate to get [tex]\frac{4}{3}[/tex] boxes packed per minute. And [tex] \frac{4}{3} [/tex] is equal to [tex]1\frac{1}{3}[/tex]
