These Tires Don't Last Long
Albert is driving a scooter. He brings a spare tire. A tire can last for 5 kilometers. How many km can Albert travel with these tires?
Assumption : A scooter needs two tires. Albert's scooter already has two tires, so with the spare tire there are three tires. All of them are new when Albert begins his journey. Albert can change his tire configuration at any time.
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Albert will first move 2.5 kms then he will change one tyre(suppose the back one) with an extra one. Then he will again move 2.5 kms so the front one will be destroyed because it can last for 5 kms only.Then he will change the front tyre with the back one which he took away earlier.After changing he'll move 2.5 kms more and thus his all three tyres will be destroyed . So, the total distance traveled will be 7.5 kms.