At 8: 00 a. m. the outside temperature was -15 degree f . at 11: 00 a. m. the temperature was 0 degree f. if the temperature continues to rise at the same uniform rate what will the temperature be at 5: 00 p. m on the same day?

Well we see that it went up 15 degrees in 3 hours.
To figure out how many degrees in one hour: 15/3=5, it goes up 5 degrees in an hour.
Then you need to figure out how many hours from 11 to 5: 5-11=6.
Multiply how many degrees an hour by how many hours: 5•6=30.
Add 30 to the old temp: 0+30=30.
At 5:00 the temperature will be 30 degrees F. :)

The answer is 109 times per second