If you drive 832 miles in a period of 21 hrs, and if you use a total of 29 gallons of gasoline on the trip,
a.) Determine the avg. speed in mi/h
I said 832/21 = x/1 => x = 39.6 mi/h
b.) Determine the avg. speed in km/h
I said 1km = 0.625 mi and so 39.6/x = .625mi => x = 63.4 km/h
c.) Determine gas mileage you used in km/L
I said 29/21 = x/1 => x = 1.38 gallons (but this gives you 1 gallon per 1 km)..