book Maths Puzzle Numerical Ability

on my question muber 4 this is the problem (l=a strait up and down line) l6-14l-2.5(7) please help me

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Two trains were traveling in opposite directions, moving away from one another. One train was moving at 5 miles per hour. The other train was moving at 6 miles per hour. They were 5 miles apart to begin with. After two hours, how far apart were they? solve the system using the subsitutin method....-2x+y=6 and 4x-2y=5 how do i do this?