If there are 9 seconds between lightning and thunder, the storm is a kilometers away. if you double the amount of time between lightning and thunder, do you think the distance in kilometers also double

No because the speed of sound is the same

Yes,, First of all, the speed of light is so fast that you can ignore the time it takes to see the lightning. It's as good as instantaneous, no matter how far away it is from you. So all the lightning does is tell you when to start your clock. And then, you hear the thunder when it reaches you. How long does that take ? The oldest motion equation you ever saw: Distance = (speed) x (time), and Time = (distance)/(speed).
Doesn't matter whether it's a bullet, a car, or thunder. If the speed is constant, then the time is proportional to the distance. It takes twice as long to go twice as far, and half as long to go half as far. Just like walking to the store.

You want to isolate your variable.