Question:
Two numbers between $0$ and $1$ on a number line are to be chosen at random. What is the probability that the second number chosen will exceed the first number chosen by a distance greater than $\frac 14$ unit on the number line? Express your answer as a common fraction.

Answer:
The probability that the second number is more than $\frac14$ unit greater than the first number decreases linearly from $\frac34$ to $0$ as the first number increases linearly from $0$ to $\frac34$. The average of this probability is $\frac12 \cdot \frac34= \frac38$. Since there is a $\frac34$ chance of choosing a number from $0$ to $\frac34$, the probability is $\frac34 \cdot \frac38 = \boxed{\frac{9}{32}}$.