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)..