The opposite of a number is the negative version of that number. The opposite of 0.005 is -0.005. The opposite of 1/2 is -1/2. Because 0 is not positive or negative, it stays the same, which is 0. I hope this helps :)
Keeping in mind that, there are 5280 feet in 1 mile, and 60 minutes in an hour and 60 seconds in each minute, thus 60*60 seconds in an hour, or 3600 seconds.
