更新1:
A 300 gallon water tank is 70 degrees. With 10 gal of water being replaced every min and the replacement water is at 55 degrees and it increases 0.16 degrees per gal, per min. How long before the tanks temp is 60 degrees? I believe this is a calculus question. but I don't know where to start. Should i use newtons law of cooling. or a weighted average.
更新2:
Is this clearer. A full 300 gallon water tank is initially 70° F. How long will it take the tank to reach 60° F, if 10 gallons of water is being replaced every minute and the replacement water is at 55° F and it increases 0.16 degrees per gal, per min. F stands for Fahrenheit. The water tank starts full.
