Question: please solve this equation and please attach all detalied steps... Here we have a 4 gallons of gasoline (A) is poured on a surface area

please solve this equation and please attach all detalied steps...

Here we have a 4 gallons of gasoline (A) is poured on a surface area of 20 ft?, Determine the time necessary for the gasoline to evaporate into still dry air (B). The diffusivity is DAB = 6.5 ft2/hr. Evaporation occurs through a 6 inch film at 65F. The gasoline has a vapor pressure of 2 psia.

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