You're at the airport waiting for the coffee you just ordered. Unfortunately, the coffee takes a long time coming, barely leaving you with five short minutes to drink it. Of course, gulping the whole thing down is out of the question: it's too hot. You quickly put your mind to work on the predicament and you remember you do have one small portion of milk with you.

Now, would it be better to immediately pour in the milk, wait 4.5 minutes and drink the coffee or to first wait 4.5 minutes and only then pour the milk in? Which option will yield the coldest coffee?



Cold Coffee *

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