10 pools with each 10% of the hash power find, each individually, a single solution on average every 100 minutes (1 hour and 20 minutes).
they dont
they find a solution in an average of 10 minutes..
SEPARATELY
their solution is only accepted every 10th time, due to the competition
being accepted as part of the chain.. is
different than how long it takes them to make a solution.
learn the context
This is only true if you mean that : once the other miners are removed and the difficulty re-adjusts to the one miner/pool.... at THAT POINT, it would be every 10 minutes on average.
But sans difficulty adjustment, if you kill 9 out of 10 pools and have only 1 pool left, it would take 100 minutes, not 10.
Is that what you meant?