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Q.

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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a

2.25km

b

0.225km

c

22.5km

d

0.0225km

answer is B.

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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