Explain simply why 5 is the correct answer to: TJ ran a 10K race last Saturday. He ran the first half in 20 minutes. He completed the second half in 30 minutes. What was his average time per kilometer?. Explanation:
He ran the 10 kilometers in a total of 20 + 30 = 50 minutes. Therefore, he ran at a pace of 50 minutes / 10 kilometers = 5 minutes per kilometer.