Question 1141524
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From the condition, the speeds of the trains A and B are 7x and 8x kilometers per hour, respectively, 

where x is the common measure of their speeds.


Therefore, for the total distance of 450 kilometers, you can write an equation


    2*(7x) + 2*(8x) = 450.


Simplify and solve for x


    14x + 16x = 450,

    30x       = 450,

      x       = {{{450/30}}} = 15.


<U>ANSWER</U>.  The train A speed is  7*15 = 105 kilometers per hour;  the train B speed is 8*15 = 120 kilometers per hour.
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