Basic College Mathematics (9th Edition)

Let's assume the x is hours mover can run on 2 gallons of gas. Now, we will write the proportion for the given details $\frac{0.8}{3} = \frac{2}{x}$ so. $0.8\times x = 2\times3$ (cross multiply) $0.8 x = 6$ $x = 7.5$ (divide both sides by 0.8) 7.5 hours mover can run on 2 gallons of gas.