Answer:
Lengths either 35 or 10
Step-by-step explanation:
Area of rectangle = 350 m
[tex]l \times b = 350 \: m {}^{2} [/tex]
Perimeter of rectangle = 90 m
[tex]l + b = 45 \\ \\ l + \frac{350}{1} = 45 \\ \\ l {}^{2} - 45l + 350 = 0 \\ \\ l = 35 \: or \: 10[/tex]
Lengths either 35 or 10