The time required to work at temperature of75degree celsius is 56.25 minutes
If a machine starts working in 45 minutes at the temperature of 60degree celsius, the amount of time worked at a temperature of 1 degree is expressed as:
Unit rate = 45/60
Unit rate = 0.75degrees celsius/minute
Determine the time it required to work at temperature of 75degree celsius
Time required = 0.75 * 75
Time required = 56.25 minutes
Hence the time required to work at temperature of75degree celsius is 56.25 minutes
Learn more on unit rate here: https://brainly.com/question/19493296
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