An olympic runner competing in a long-distance event finishes with a time of 2 hours, 45 minutes, and 35 seconds. the event has a distance of 27.3 miles. what is the average speed of the runner in kilometers per hour?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.