给我8分钟，我去拯救世界.不到一杯咖啡冷却的时间.为什么是8？因为，...
A soldier wakes up in someone else's body and discovers he's part of an experimental government program to find the bomber of a commuter train within 8 minutes.
U.S. Army pilot Captain Colter Stevens wakes up on a Metra commuter train going into Chicago. Stevens is disoriented, as his last memory was of flying a mission in Afghanistan.
However, to the world around him – including his friend Christina Warren and his reflection in the train's windows and mirrors – he appears to be a different man: a school teacher named Sean Fentress. As he expresses his confusion to Christina, the train explodes while passing by another train, killing everyone aboard.
....
Stevens: Can I have a cup of coffee for a moment?
-Christina: Well, how long does it take you to get a cup of coffee?
Stevens:Well...
Suppose the temperature is...
室内环境温度 ambinet temperature = 20 摄氏度
咖啡冲泡温度 initial temperature =T0 90 摄氏度
你喜欢 饮用的咖啡温度 = 60 摄氏度
水的衰减常数 没有查，先不妨假设 k=0.2
then time elapaed=?
t=2.2 minutes
so what do U wanna do today?
