The answer is the first rectangle has the length 14 m and the width 5 m. The second rectangle has the length 10 m and the width 7 m.
The equation is...
70=(70/y+4)*(y-2) {y= width of the first rectangle}
and when you solve you get y is either -5 or 7 and because -5 doesn't make sense y is equal to 7