You failed to understand how mining works. The hashes you get which dont solve a block, dont "build up" a block at all. Some hashes are just "lucky" enough to solve one.
Mining has no memory effect, its completely "random".
It does not matter if you put 200kHs and 300kHs at the same *coind or different one.

Please stop spreading misinformations as it confuses newbies believing this which therefore hurts the future newbies.

There are enough Threads/Posts which explain why it dosnt add up!