In total, he ran 10,000 meters. The way you can find this is by finding how many meters are in a kilometer (which is 1,000), after that you need to convert everything to meters, so running 8km is now running 8,000 meters, sprinting 500 meters doesn't change, and climbing bleachers for 1.5km is now 1,500 meters.
If you add all of these numbers up you will get your answer of 10,000 meters
