英语翻译A cat wants to get a mouse that is 10 steps away from it

英语翻译
A cat wants to get a mouse that is 10 steps away from it.We know that When the cat takes 5 steps the mouse takes 9 steps.For the time that the cat takes 2 steps the mouse can take 3 steps.How many steps does the cat have to take in order to get the mouse?
一个英语国家的小朋友问我的题 人家问我是不是得50…… 我承认我没看懂……