So, you would have a total of three drives. What is the storage capacity of the SSD? This will make a difference in the recommendations for what to store and where. One thing to keep in mind is that you need to keep somewhere between 10 and 20% of the SSD drive space free for optimal performance. The 7200 RPM is a normal hard drive so I'm not sure what you mean by "the other one is a normal one". Most laptop mechanical drives spin at 5400 RPM and most mechanical desktop drives spin at 7200 RPM while some "high speed" drives spin at 10,000 RPM.
the sdd is 238 gb and the other hdd i would imagine is 5,400 rpm i would imagine cause its not fast.