AMC8 2016 8, Problem 1

The longest professional tennis match ever played lasted a total of $11$ hours and $5$ minutes. How many minutes was this?

Solution: It is best to split 11 hours and 5 minutes into 2 parts, one of 11 hours and another of 5 minutes.  We know that there is $60$ minutes in a hour.  Therefore, there are $11 \cdot 60 = 660$ minutes in 11 hours.  Adding the second part(the 5 minutes) we get $660 + 5 = \fbox{665}$.

Answer: 665