From float to hour and minutes

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Hi!!

I'm calculating the amount of time that an electric plant can operate with a
certain amount of gas, let's say:

A plant can work an hour with 10 galons, How long does it will work with 300
galons?

hrs = (300 galons / 10 galons) = 30 (I could also have a float here!!!)

Then, I have the time the plant was refilled, let's say 16:42, so I need to
calculate the next hour the plant needs to be refilled. Like 16:42 hrs + 30
hrs

How can I sum these two values?
How can I convert the integer or float value 30 to a hour format?

Any ideas?

-----------------------
Miguel Guirao Aguilera
Logistica R8 TELCEL
Tel. (999) 960.7994
Cel. 9931 600.0000


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