Jawab no 7 ya kak....please....

[tex] \frac{p}{l} = \frac{5}{3} \\ l = \frac{3}{5} p \\ 18 = \frac{3}{5} p \\ 90 = 3p \\ 30 = p \\ \\ \frac{p}{t} = \frac{3}{2 } \\ p = \frac{3}{2} t \\ 30 = \frac{3}{2} t \\ 60 = 3t \\ 20 = t[/tex]
semoga bermanfaat