First, set up a proportional fraction.
[tex]\frac{5 sec}{30 gallons}[/tex] = [tex]\frac{x sec}{1gallon}[/tex]
Cross multiply
5 * 1 = 5
30 * x = 30x
So,
30x = 5
Divide 5 by 30
x = 5 / 30
x = 1 / 6 or 0.17
Do the same thing to find for 17 gallons.
30x = 85
x = 85 / 30
x = 17 / 6 or 2.8
