First run 2.5 km and change the 1st tyre with stepney. Now kms remains in 1st Tyre: 2.5 km, 2nd tyre: 2.5 km, Stepney : 5 km

Again run for 2.5 km and this time change 2nd tyre with 1st tyre: Now kms remains 1st tyre: 2.5 km, 2nd tyre :0 km ,stepney : 2.5 km.
Now run 2.5 km with remaining 1st tyre and stepney .

Total: 2.5+2.5+2.5=7.5

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Question: There were 4 Pears in the basket and 4 people in the room. Each person took one pear and at the end there was still one pear left in the basket. how is it possible?

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Ans: The last person took a pear with the basket.

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Also read : 100 coins on table puzzle

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Question: Can you unscramble the word "LEOV"?

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Ans: LOVE

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Also read : 100 coins on table puzzle

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Question: You can hold it only with your right hand but never with your left. What is it?

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Your left Hand

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Read also : 100 coins on table puzzle-3

 

Source :  Quora

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Let’s consider a case
Pile 1: 88T, 2H
Pile 2: 2T, 8H

Flipping the coins in Pile 2

Pile 1: 88T, 2H
Pile 2: 2H, 8T

Pile 1(heads) = Pile 2(heads)

Let Tire numbers be 1,2,3,4,5
1) Use Tire 1234 for 0-200 km
2) Use Tire 1235 for 2000-400 km
3) Use Tire 1254 for 4000-600 km
4) Use Tire 1534 for 6000-800 km
5) Use Tire 5234 for 8000-1,000 km

As you may have noticed, each Tire is used 4 times so total of 200×4 = 800 KM
As we can see each Tire gets to run 800 km

Correct answer: 800 KM