book Maths Puzzle Numerical Ability

can you please help me with {x+12y=68
{x=8y-12

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TWO TRAINS LEFT THE SAME STATION AT THE SAME TIME. MARINO'S TRAIN WAS TRAVELING DUE NORTH AT A SPEED THAT WAS 10 MPH FASTER THAN THE KRYSTLE TRAIN, WHICH WAS TRAVELING DUE EAST. AF Help. I can figure this out on paper by drawing a calendar.(More than one answer is possible) How do you write an equation to figure it out.
Suppose that July of year N has five