Both mixed numbers have a denominator of 4, so we can convert them both to improper fractions to make the comparison easier. To do so, multiply the denominator by the whole number, then add the numerator. Put this number over the denominator.
[tex] \frac{13}{4}- \frac{7}{4}= \frac{6}{4} [/tex]
AS you can see from the calculation above, we can find how much longer Antonio spent driving by subtracting the two numbers.
The answer is [tex] \frac{6}{4} [/tex] hours, which reduces to [tex] \frac{3}{2} [/tex].
