To solve this problem, we need to determine the value of x, which represents one of the distinct numbers selected from the given set.
We know that the answer is 2, which means that one of the distinct numbers selected must be 2. 
Therefore, the value of unknown variable x is 2.
The answer is: 2
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Two distinct numbers are selected simultaneously and at random from the set $\{1, X, 3, 4, 5\}$. What is the probability that the smaller one divides the larger one? Express your answer as a common fraction. The answer is 2. What is the value of unknown variable X?

### Answer:
