Answer:
You must divide the time by the distance. Have you ever heard of Distance=rt?
Explanation:
Basically, the r stands for rate and the t stands for time, so first, the problem would look like this:
4.6=r(48)
So to find the rate, you would do the opposite of multiplying the rate times the time, so you would divide 48 by 4.6 to get the answer, then I believe to round to the nearest whole number.
I'm not positive, but hopefully this helps.