## Chemistry 9th Edition

1 mi/hr = 1.61 km/hr Thus 65 mi/hr = 104.65 km/hr Since speed = $\frac{Distance}{Time}$, Thus Time = $\frac{Distance}{Speed}$, $\frac{Distance}{Speed}$ = $\frac{112}{104.65}$ = 1.07 hours Time = 1.07 hours = 64.2 minutes. For gasoline, 1 mile= 1.61 km Thus, 28 miles = 45.08 km. Thus, 45.08 km takes up one gallon of gasoline. Thus 112 km will take 2.48447 $\approx$ 2.49 gallons of gasoline.