Ok we have this rectangle questiosn that makes no sense to me.

Here is a diagram of the question

The smaller rectangle is 4 by 5 metres which the area would be 20 metres. Then the rectangle 'grows' bigger and then has an area of 56mē. How do I get the length and the width of the second rectangle? I think I know the answer but I don't know how to get it.

Any help is greatly appriciated, thanks!