To find the cost per cracker, we first need to determine the total number of crackers in the box.
The box contains 6 individual bags, and each bag contains 18 crackers.
So, the total number of crackers is: \[ 6 \text{ bags} \times 18 \text{ crackers/bag} = 108 \text{ crackers} \]
Next, we know the total cost of the box of snacks is $5.40.
Now we can calculate the cost per cracker: \[ \text{Cost per cracker} = \frac{\text{Total cost}}{\text{Total number of crackers}} = \frac{5.40}{108} \]
Calculating the cost per cracker: \[ \text{Cost per cracker} = \frac{5.40}{108} = 0.05 \]
Thus, the cost per cracker is: \[ \boxed{0.05} \]