The equation for r: d = rt would be 'r equals d over t.'
How, you might ask? Well, let's consider this example:
You might already know what d = rt stands for... "Distance equals rate times time", so if you divide the two sides by 't', you would come up with r = d/t. So that would finalize as your answer for this question.
This is what I got for the question you wanted the answer for...
Hope this helps you ☁︎☀︎☁︎♥︎
In simplest form that would -1 13/36