Kira's cat eats a pound of kibble every 4 hours. Kira fills her cat's bowl with 3 pounds of kibble before going to work. When she returns, Kira weighs the bowl and there is still 1 pound left. How many hours was Kira away from home?
Kira's cat has eaten 3 pounds - 1 pound = <<3-1=2>>2 pounds of kibble.
Since the cat eats one pound of kibble every 4 hours, Kira has been out 4 hours * 2 pounds/hour = <<4*2=8>>8 hours.
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