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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.
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are not sufficient.
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正确答案: D

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