Let x be the rate of the freight train, in miles per hour (the value under the problem's question).


Then the time equation is


     = .


Solve it for x. Start cross-multiplying


    348x = 210*(x+23),

    348x = 210*x + 210*23

    x =  = 35.


Answer.  The freight train rate is 35 miles per hour.

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In this case, refer to the problem's ID number, which is 1134526.


Otherwise, I will not know to whom to answer.