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Guess the height

Guess the height

Imagine two pieces of railroad track of one km in length, laid end to end on ground. Each track has been nailed at the end and they join in middle.
Due to heat the tracks expand,each by 1 cm. The tracks are sturdy, remain straight but rise in the middle.
Guess by how many cms the tracks will rise ,in the middle, above the ground? No calculator please!
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