-5 is an integer because integers are all whole numbers with the inclusion of their opposites (negative values). -5 is rational because it can be expressed as a ratio of two integers (-5/1). -5 is a real number because all integers and rational numbers are real numbers.
Her elevation went down too quickly, if she is going down 300 ft per hour at a constant rate, at 1 hour, she should be at 2700 feet. It should take her about 10 hours to get down the mountain.
