Distance between two places is 200km. a of metal is 2.5 × 10-5 /°C. Total space that must be left between steel rails to allow a change of temperature from 36°F to 117°F is
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Distance between two places is 200km. a of metal is 2.5 × 10-5 /°C. Total space that must be left between steel rails to allow a change of temperature from 36°F to 117°F is