11 minutes!!

A cop was patrolling late at night in a well-known spot. He sees a couple in a car with the interior light brightly glowing. The cop carefully approaches the car to get a closer look.

Then he sees a young man behind the wheel, reading a computer magazine. He immediately notices a young woman in the rear seat, knitting. Puzzled by this surprising situation, the cop walks to the car and gently raps on the driver's window.

The young man lowers his window . "Uh, yes, officer?" The cop says: "What are you doing?"
...
The young man says: "Well, Officer, I'm reading a magazine." Pointing towards the young woman in the back seat the cop says: "And her, what is she doing?"

The young man shrugs: "Sir, I believe she's knitting a pullover sweater."

Now, the cop is totally confused. A young couple. Alone, in a car, at night in a Lover's lane....and nothing obscene is happening!

The cop asks: "What's your age, young man?" The young man says, "I'm 22, sir." The cop asks, "And her ... what's her age?"

The young man looks at his watch and replies: "She'll be 18 in 11 minutes."