Question
Some trees are placed along a street at equal distances.
The distance between the 2nd and the 6th tree is 7.8 m.
What is the distance between the 1st and the 3rd tree?
3 m

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Some trees are placed along a street at equal distances.
The distance between the 2nd and the 6th tree is 7.8 m.
What is the distance between the 1st and the 3rd tree?