Answer :
since 2 hours is 120 minutes, then
[tex]\bf \begin{array}{ccll} \stackrel{download}{minutes}&\stackrel{show}{minutes}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 13&39\\ x&120 \end{array}\implies \cfrac{13}{x}=\cfrac{39}{120}\implies \cfrac{13\cdot 120}{39}=x[/tex]
[tex]\bf \begin{array}{ccll} \stackrel{download}{minutes}&\stackrel{show}{minutes}\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 13&39\\ x&120 \end{array}\implies \cfrac{13}{x}=\cfrac{39}{120}\implies \cfrac{13\cdot 120}{39}=x[/tex]