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What is the maximum distance the car can travel before you are forced to buy a new tyre?

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A car has 4 tyres and 1 spare tyre. Each tyre can travel a maximum distance of 20000 miles before wearing off. What is the maximum distance the car can travel before you are forced to buy a new tyre? You are allowed to change tyres (using the spare tyre) unlimited number of times.

posted Jun 29, 2017 by Sumana

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