Cars Catching Up

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While on a straight road, Car C and Car D are traveling at different constant rates. If Car C is now 10 miles behind Car D, how many minutes from now will Car C be 20 miles behind Car D?

(1) Car C is traveling at 30 miles per hour and Car D is traveling at 40 miles per hour.

(2) Thirty minutes ago Car C was 5 miles behind Car D.