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Railway lines are laid with the gaps to allow for expansion. The gap between two lines is 0.5 cm at 10 °C. If the length of a line is 12 m then temperature at which the lines just touch each other is [alpha = 11 x 1O'6/ °C]

A

`27.8^@C`

B

`37.8^@C`

C

`47.8^@C`

D

`57.8^@C`

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