There are 5 boys and three girls. If two girls cannot sit next to each other, how many ways can all of them sitin a row together.

I'm not really sure if what I did was right, but my answer is 240. I added 5! (number if combinations the boys can make) and 6!/(6-3)! (the number of slots between the boys distributed to the number if girls) I got 120 for each. I'm not really sure if what I did was right, or even how to check if it's right.