SOLUTION: suppose two trains leave a certain station, at the same time, traveling in opposite directions. one train travels 10 mph faster than the other. in 3.5 hours, the trains are 357 mil

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Your equation is


    3.5x + 3.5*(x+10) = 357  miles  for the total distance apart them.


Here x is the rate/speed of the slower train.


Solve it; then evaluate (x+10) for the faster speed.