Answer:
t = d/r
Explanation:
This can be seen by dividing both sides of the original formula by r, which gives d/r = rt/r, or t = d/r. This equation states that the time t it takes for an object to travel a certain distance d at a constant rate r is equal to the distance divided by the rate. This is the same as the formula d = rt, but with the terms rearranged. The other equations you provided are not equivalent to the original formula.