A rectangle has an are of 25 square feet.A similar rectangle has an are of 240 square feet.what is the ratio of the areas of these similar rectangles?

Question

I dont understand this question i got 9.6/1 but it counted my answer wrong and no one knows how to help me.

A rectangle has an are of 25 square feet.A similar rectangle has an are of 240 square feet.what is the ratio of the areas of these similar rectangles?

Answer 1

Simply divide the second area by the first area (scale
factor can be an integer or a fraction). Given lengths
of a the sides of a rectangle, if the sides are multiplied
by a factor of "k", the corresponding areas are are
multiplied by "k²".

For example, given a rectangle of sides 3"x5". Area is 15in². 
Let's double the side lengths (k=2) to 6"x10". Area is
now 60in².

60/15=4.......the scale factor (or k²) for area is 4, or 2².

Try several more examples by tripling (k=3) or quadrupling
(k=4) the 3"x5" original rectangle side lengths and determining
the corresponding scale factors for area. You should see a
pattern.

Answer 2

Is the answer 25/240=5/48

or 0.104 ?