Which of the following is true $?$

Find the ratio of the following and express them in the simplest form.

$360 \mathrm{mL}, 500 \mathrm{mL}$

Find the ratio of the following and express them in the simplest form.

$4 \mathrm{hrs} 20 \min , 6 \mathrm{hrs}$

Express the following in the simplest form.

$4\frac{1}{5}:2\frac{3}{4}$

Express the following in the simplest form.

$2\frac{3}{8}:3\frac{5}{6}$

Find the greatest ratio of the following:

$1:6, 3:8$

Find the greatest ratio of the following:

$9:16; 5:12$