book Maths Puzzle Numerical Ability

Totally confused where to even begin on this problem!!
In a race, Mary is 50 ft in front of Susie after 10 seconds. How fast can Mary run if Susie runs 20 ft. per second?
Thanks

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book Other Question
The length of a rectangle is 8 inches more than twice its width. If the perimeter of the rectangle is 28 inches, find the width of the rectangle How do I solve

x +3y -6z =7
2x -y +z =1
x +2y + 2z =1

Thanks,
Tijuana