Answer:
-15 degrees farenheit
Explanation:
sea level is at 0 feet, and the temperature decreases by 3 degrees every thousand feet. since we are at 25,000 feet, that would be 25 increments of -3 degrees, which is -75 degrees. but we're not finished here, because the temperature at 0 feet is 60 degrees. so, if we subtract 75 from 60, we get our answer of -15 degrees farenheiht.