We know that distance = rate(time). We need to solve for time here.

The car took 2 hours to travel 90 miles at a speed of 45 mi/hr
She worked 2 and 1/2 hours yesterday, and today she did 4 and 1/4 hours.
first off, let's check how many hours she worked total, and divide 54 by it.
so, first off, let's convert the mixed fractions to "improper" and add them up.

The answer is.. 23 and 16
Hope this helps!!