Thanks for writing in. It sounds like you are using one of our training plans.
Those instructions mean that you warm up for 15 minutes. Note that the ‘ symbol can be used interchangeably to indicate feet in distance, minutes in time, and arc minutes in angle. So context matters. Here we are referring to time so it means minutes of time. So during this warm up one will do 10 minutes easy followed by 1 minute fast and one minute easy for the remaining 5 minutes of the warm up.
Continuous hills refer to a hill where the full duration of the up portion of the workout can be completed continuously rather then having to do laps on a smaller hill. But in your case you can also do laps on your local ski hill. If possible you might consider occasionally doing some longer sustained uphill work on a steep treadmill.
I hope this helps,