Going to the Airport...

Nope, not me. Just the guy in today's Brain Bender... Who writes these questions??

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Eddie is driving his car to the airport to pick up his wife. At his current speed, he'll arrive on time. If he drives 5 miles per hour faster, he will arrive 12 minutes early, but if he drives 5 miles an hour slower, he'll arrive 15 minutes late.

How far away is the airport?

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And more importantly, what is Eddie's wife going to do when she sees a strange woman's earring on the floor when she gets in, Huh?? That's what I want to know...

Okay, you know how to play. Answers and scenarios will be found in the comments later...

Update: Friend and reader Rich Blank is the winner of the smartypants sticker for this one. He even went above and beyond, providing the mathematical proof for us! Thanks Rich!