Part b if this car's gas tank holds 45 l, how many tanks of gas will you use to drive 1800 km? express your answer using two significant figures.

The consumption rate of the car from previous part was 55 mpg (miles per gallon). We convert this to kilometers per liter.

1km = 06214 miles

1 gallon = 3.788 liters

hence, 55 mpg will be;

55 * 1/0.6214*1/3.788 = 23.4 km / L

Thus, its mileage will be 23.4 km/L

For a distance of 1800 km the car will use; 1800/23.4 = 76.923 L

but, we know that the car gas tank holds 45 L

Hence, for a distance of 1800 km the car will use 76.923 / 45 = 1.7094 tanks

That will be 1.7 tanks (two significant figures)