Here is the answer for this question,
In order to simplify, we first need to convert 1 foot to inches
= 1 Foot = 12 Inches
So now the ratio would be,
= 30 (Inches) : 12 (Inches) (Basically 30:12)
Now we simplify the ratio,
= 30:12 => 15:6 => 5:2
Therefore, the Simpliest Ratio for 30 (Inches) : 1 (Foot) is 5:2 (Inches)