In a model of a ship, the mast is 9 cm high , While the mast of the actual ship is $12\;cm$ high. If the length of the ship is $28\;cm$ how long is the model ship.

Question

$\begin{array}{1 1} 21\;m \\ 22\;m \\ 23\;m \\ 24\;m \end{array} $