puzzles

[Rota]

418,324,913-3.41<321,912,811x-2,348,292,934

Please solve x.

x > 8.59
I just used a basic calculator, though I was tempted by the graphing calc.

On the Catz riddle: We are assuming that said cats can keep up this rate for 100 minutes, when everone knows that they would take a good long nap in between.

Or they would each catch one mouse and play with it for the whole 100 minutes, rather than catch another.