real noob looking for help!

[hdpe1399]

hey guys! real noob here.

I'm trying to solve a problem where there is a unknown(random) MD5 hash1

and that hash is repeated several times, with a few known words in-between them.

for example like this:

(hash1)(hash1)someKnownWord(hash1)anotherKnownWord(hash1)

which is then made into another given MD5 hash2.

right now i know the number of repeated hashes, the content and position of the known words.

so the questions is: 

1. how do i set up the rules in this situation?
2. will it take a reasonable amount of time to find the first hash?