Sam needs to order lunch in time to get here when lunch starts.
It is currently 10:58 lunch starts at
11:15
If the food she orders will take 17-3 minutes to get here at what time should she order her food so it gets here on time?
Sam should order her food by 10:58 + 17 minutes = 11:15.
Therefore, Sam should order her food by 11:15 - 3 minutes = 11:12.
So, Sam should order her food by 11:12 to ensure that it gets here on time for lunch at 11:15.