Brain Game: I'm So Tired

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Tom owned an old Ford LTD that was in reasonably good shape for its age. He sold it on eBay, and worked out a deal with the buyer, who wanted to restore the car to its original glory. Tom would drive the car to the buyer's garage, some 1,800 miles away, where the new owner would buy Tom a hotel room for the night and spring for a plane ticket back home. The car was ready for the trip except for one thing: It lacked tires.

Tom's neighbor, Walt, had eight used tires that fit the LTD, but all of them were old and wouldn't make it very far. Each of the tires had enough tread to travel 1,200 miles, but he wouldn't trust them past that point. Of course, driving a gas-guzzler for such a long distance, Tom wanted to save as much money as possible by traveling light.

"I hate having to put four tires on the car and then carry four more in the trunk," Tom said.

"You don't have to take that many spares," Walt corrected.

What's the minimum number of spare tires
Tom would have had to bring with him
to safely complete the journey?

Here is the SOLUTION.

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April 6, 2009 - 3:30am
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