February 2019 2 9 Report
Suhu dalam ruangan mula-mula 30 derajat celcius.Karena ruangan tersebut ada AC,jika AC dihidupkan setiap 1 jam suhu ruangan turun 5 derajat celcius.Berapa jam waktu yang diperlukan jika suhu akhir 20 derajat celcius ?

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