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Question 1 of 5
The government railroad plans to replace its old cross-country trains, which have a maximum speed of 80 miles per hour, with new trains that have a maximum speed of 125 miles per hour. But the tracks on which the trains will run cannot handle trains at speeds higher than 80 miles per hour. Therefore the new trains will not be able to make the cross-country trip in less time than the old trains.
Which of the following, if true, most seriously weakens the argument?