The ratio in its simplest form is 1/4.
We need to determine the ratio in the simplest form between 30 minutes and 2 hours.
To obtain the required ratio, the calculation must be done in a single unit of measurements, therefore change the hour calculation into minutes.
We know that 1 hour is equivalent to 60 minutes.
Therefore,
[tex]\begin{aligned}2\;\rm{hours}&=2\times 60 \;\rm{minutes}\\&=120\;\rm{minutes}\end{aligned}[/tex]
Thus, the required ratio is calculated below:
[tex]\begin{aligned}\rm{ratio}&=\dfrac{30}{120}\\&=\dfrac{1}{4} \end{aligned}[/tex]
Hence, the ratio in its simplest form is 1/4.
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