You drove 18 miles in 20 minutes at a constant speed and did NOT exceed the speed limit, given in miles per hour. Among the following, which is the lowest that the speed limit could have been?

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\(20\) minutes is \(\dfrac{1}{3}\) of an hour.

$$ d=rt $$ $$ r=\frac{d}{t} $$ $$ r = \frac{18}{\frac{1}{3}} $$ $$ r= 54 $$

Since we did not exceed the speed limit, the lowest it could be is 55.