Question 1200124
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The method I personally find easiest to use on a problem like this is to consider how changing the number of rats and the amount of time changes the number of cats required.<br>
More rats means more cats are required, so 72 rats instead of 5 rats means multiply the number of cats required by 72/5.<br>
More time means fewer cats are needed, so 2 hours (120 minutes) instead of 5 minutes means multiply the number of cats required by 5/120.<br>
{{{(5)(72/5)(5/120)=(72)(1/24)=3}}}<br>
ANSWER: 3 cats<br>