Distance traveled varies jointly as rate and time. if fred travels 135 miles in 3 hours at a rate of 45 mi/hr, find the rate at which he travels to cover a distance of 189 miles in 3.5 hours. can someone kind of lay out what i should plug in to solve this?

From the relation, d is joint proportionaly with r and t.
Thus,d = krt.

Using the first set of given, we could calculate for k.135 = k(45)(3)k = 1

Using the computed value of k.d = krtr = d/ktr = (189)/(1)(3.5) = 54 mph.

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Ya i could just need to know what type of math