1. The problem asks to solve a motion application using a linear equation in one variable, given a speed of 12 km/h. 2. The general formula for speed, distance, and time is: $$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$$ 3. To find any one of these variables, rearrange the formula accordingly: - Distance: $$\text{Distance} = \text{Speed} \times \text{Time}$$ - Time: $$\text{Time} = \frac{\text{Distance}}{\text{Speed}}$$ 4. Since the problem only gives speed (12 km/h) and no other information, we need either distance or time to solve for the unknown. 5. Without additional data, the problem cannot be solved further. If you provide distance or time, I can help solve for the missing variable. 6. For example, if time is $t$ hours, then distance $d$ is: $$d = 12 \times t$$ 7. Or if distance is $d$ km, then time $t$ is: $$t = \frac{d}{12}$$ Please provide more information to proceed with the solution.