It seems like a simple maths question but this man's wife gives him anything but a simple answer.
"If you are travelling 80 miles per hour, how long does it take you to go 80 miles?" he asks.
A deeply puzzled expression appears on her face as she tries to work it out.
"When I'm running 80 miles I'm probably running about 10 miles per hour, if that. And that's pretty fast for a human being," she responds.
She eventually decides to "whack 80 in half – and that's 40" and refuses to believe her husband when he tells her otherwise.
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