Convert hours to hundredths in Excel

Hello,

I am a beginner in Excel.

Let’s take an example:
A1: 7:30 A2: 9:50 which equals 2:20.

How can I ensure that the result of 1:20 is systematically converted into a decimal? And that it translates to 2.33?

Please be explicit, as I will have a bit of trouble understanding.
Thank you very much for your help.
Best regards

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