Answer: The length is 5 times the width
Explanation:
Given: The area of rectangle =

Here x must be a positive real number since it can not be negative.
Also for area of rectangle =

And length is always greater than width of rectangle, therefore in the given expression 'x' must be width and '5x' must be length of rectangle .
[∵ for every positive x , 5x>x]
Hence, the coefficient 5 means the length is 5 times the width.