The result of $30 \div 40$ is:

$30 \div 40 = 0.75$

This can also be written as a fraction:

$\frac{30}{40} = \frac{3}{4}$

Would you like any further details or explanations on this?

Here are five related questions:

1. What is $40 \div 30$?
2. How do you convert a decimal like 0.75 to a percentage?
3. What is $\frac{3}{4}$ as a decimal and percentage?
4. How do you simplify fractions like $\frac{30}{40}$?
5. What is the result of $30 \div 80$?

Tip: When dividing two numbers, you can express the result as a decimal, fraction, or percentage, depending on the context!