eeds to prepare the soup before the end of his shift. Initially, as Tolits is preparing the soup, its temperature is 21∘C and placed on a pan heated at 149∘C. After 5 minutes, its temperature is 36∘C. The soup is done (cooked) once its temperature is 120∘C. Tolits found out that cooling it in a sink full of cold water, while the faucet is running with the water resulting to roughly cons
Given problem:
Tolits is working on a restaurant famous for its soup. His end of shift is 5:00 pm and needs to go home by that time to pick up his wife, Marites for their anniversary date. A customer made a reservation at 5:15 pm and wants his soup to be ready at that exact time. To ensure the quality of the soup, it should be served at a temperature which is exactly 86C. Tolits needs to prepare the soup before the end of his shift. Initially, as Tolits is preparing the soup, its temperature is 21∘C and placed on a pan heated at 149∘C. After 5 minutes, its temperature is 36∘C. The soup is done (cooked) once its temperature is 120∘C. Tolits found out that cooling it in a sink full of cold water, while the faucet is running with the water resulting to roughly constant temperature of 26∘C, could bring the temperature of the soup to 86C to be ready at 5:15 pm. How many minutes before the end of the shift of Tolits should he start cooking soup so that he is done before 5:00 pm and his co-worker can serve it at 5:15pm?
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