Step-by-step explanation:
We need to add 3/4 of an hour to Alan's time.
Let's put Alan's time into a pure fraction.
[tex]1\frac{1}{2} = \frac{2}{2}\frac{1}{2} = \frac{3}{2}[/tex]
Now we can add 3/4 to 3/2.
First, we need to find a common denominator (the bottom number).
4 and 2 is easy. The common denominator is 4. So let's solve it.
[tex]\frac{3}{2} * \frac{2}{2} = \frac{6}{4}[/tex]
[tex]\frac{6}{4} + \frac{3}{4} = \frac{6+3}{4}[/tex]
