Excuse me: Can the cat catch up with the mouse at this speed? If so, how many steps will it take to catch up?
Answer: you can catch up.
The ratio of the length of each step between cat and mouse is 9: 5.
Meanwhile, their step ratio is 2: 3.
Then their speed ratio is 18: 15.
Cats are faster than mice. If the cat catches up with the mouse after step X, there are:
Equation10/(18-15) = x/18.
Get x = 60.
That is, the cat catches up with the mouse 60 steps.