By using cross mutliplication, there are 24 gallons in the water tank after 30 minutes.
How to estimate the filling time of a water tank by cross multiplication
According to the statement the water tank is full at constant rate, 10 % tank capacity per each 5 minutes. The tank has a capacity of 40 gallons. The gained capacity is determined by the following cross multiplication:
x = [0.1 · (40 gal)] × (30 min / 5 min)
x = 24 gal
There are 24 gallons in the water tank after 30 minutes.
To learn more on cross multiplication: https://brainly.com/question/15209325
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