Question 1156499
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Let the train A speed be x mph;  then the train B speed is (x-25) mph.


The time equation is


    {{{240/x}}} = {{{165/(x-25)}}},   or


    {{{48/x}}} = {{{33/(x-25)}}}.


Cross multiply and continue step by step


    48*(x-25) = 33x

    48x - 48*25 = 33x

    48x - 33x = 48*25

    15x = 48*25

      x = 16*5 = 80.


<U>ANSWER</U>.   Train A speed is 80 mph.  Train B speed is 80-25 = 55 mph.
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Solved.