To find out how many hours George spent reading, we first need to calculate \( \frac{2}{5} \) of the time that Ricardo spent reading.
Ricardo spent \( 7 \frac{1}{2} \) hours reading. We can convert this mixed number into an improper fraction:
\[ 7 \frac{1}{2} = 7 + \frac{1}{2} = \frac{14}{2} + \frac{1}{2} = \frac{15}{2} \]
Now we can calculate \( \frac{2}{5} \) of \( \frac{15}{2} \):
\[ \text{George's time} = \frac{2}{5} \times \frac{15}{2} \]
We can simplify this multiplication:
\[ \frac{2 \times 15}{5 \times 2} = \frac{30}{10} = 3 \]
Thus, George spent \( 3 \) hours reading over the weekend.
Therefore, the answer is:
\[ \boxed{3} \]
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