Coffee Is Best Enjoyed at a Temperature of 118°F

Multiple Choice

Coffee is best enjoyed at a temperature of 118°F. A restaurant owner wants to discover the temperature T at which he should serve his coffee so that it will have cooled to this ideal temperature in 4 minutes. He discovers
That a cup of coffee served at 197°F cools to 184°F in one minute when his restaurant is at 68°F. If he maintains
The restaurant temperature at 68°F, at what temperature should he serve the coffee to meet his goal?

A) 144°F
B) 139°F
C) 164°F
D) 197°F