Show work please, ANSWER IN THE NEXT 10MIN

Problem 5. (10 points) Jones figures that the total number of thousands of miles that a used car can be driven before it would need to be junked is an exponential random variable with parameter 20. . Smith has a used car that he claims has been driven only ten thousand miles. If Jones purchases Smith's car, what is the probability that she would get at least thirty thousand additional miles out of it