Keeping It Hot

Classical Mechanics Level pending

Josh makes a cup of coffee at a station that is a few minutes walk from his lab. The coffee is piping hot when it fills the cup and he pours soy creamer into the coffee at some point before he drinks it. The creamer is kept in the refrigerator and is much colder than the coffee.

If Josh wants the coffee to be as hot as possible when he gets back to the lab, at what point should he add the creamer to the coffee?

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