MHB How does temperature affect the length of a steel measuring tape?

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Temperature significantly affects the length of a steel measuring tape due to its coefficient of linear expansion. At 70°F, a steel tape measures 100,000 feet, but at 10°F, it contracts. The calculation shows that the length of the tape at 10°F is approximately 99,651.24 feet. Consequently, a distance of 90,000 feet at 10°F corresponds to a reading of about 110,723.6 feet. This demonstrates the importance of accounting for temperature when using steel measuring tapes.
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A certain steel tape is known to be 100000 feet long when the temperature of 70°F . When the tape is at a temperature of 10°F, what reading corresponds to a distance of 90000 ft? Coefficient of linear expansion of the tape is 5.833 x 10-6 per °F.
 
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My first thought was "what in the world is a "reading"? Finally I realized- this is NOT just a "steel tape" but a steel measuring tape! Let "x" be the length of the tape at 10 degrees F. When the temperature increases from 10 degrees F to 70 degrees F, an increase of 60 degrees F, the tape will have increased by a factor of 1+ 5.833 x 10^(-6) x 60= 1+ 349.98 X 10^(-6)= 1+ 3.4998 x 10^(-4)= 1.00034998. Since the length after the expansion is 100,000 feet, we must have 1.00034998x= 100,000. So the length of the tape at 10 degrees F is x= 100000/1.0034998= 99651.24058. The reading, at 90,000 feet, at 10 degrees F is given by \frac{y}{90000}= \frac{100000}{99651.24058}. y= 10(99651.24058)/9= 110723.6 feet.
 
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