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## How far can you go? 2

You have a 4 wheels car and a spare tire in the trunk.

The tire being used will be worn off for 1/4 part of it per mile (completely wear out for 4 miles)

How to make use of the spare tire to go as far as possible?

Replace the tires in following way, you can drive for 5 miles.

The numbers denote the lives of tires. The tricky part is to switch the tires after every mile you drive.

Begin:

``````    4__4
``````

car : | | spare tire: 4

``````    4__4
``````

After the first one mile:

``````    4__3
``````

car : | | spare tire: 3

``````    3__3
``````

After the second one mile:

``````    3__3
``````

car : | | spare tire: 2

``````    2__2
``````

you got the idea...

``````    2---2
``````

car : | | spare tire: 1

``````    2---1

1---1
``````

car : | | spare tire: 0

``````    1---1
``````

nik

simply replace tyre 1 by the spare tyre after 1mile then after total distance covered by the car is 2 miles then put the spare tyre (i.e the tyre which is spare now) in place of tyre 2 then do it similarly for tyre 3 and tyre 4

Tarun245

Keep switching tyres every 1/4 mile

leilei3915

2018529 leilei3915

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almost 7 years ago
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