30. Simplify the expression $6 \sqrt{8} \cdot \sqrt{5}$.

Step 1 ：Multiply the numbers inside the square roots: \(6 \sqrt{8} \cdot \sqrt{5} = 6 \sqrt{40}\)

Step 2 ：Simplify the result: \(6 \sqrt{40} = \boxed{37.95}\)