Riddles!

is it 100 minutes? Because 1 cat would take 1 minute to catch 1 mice, so it takes 100 minutes for 100 cats to catch 100 mice...
 
The answer I was given was 3 minutes - this is because the cats are not catching the mice sequentially but each cat is catching its mouse at the same time as the rest. Sounds like a trick question indeed!
 
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