Explain how the offspring receives two copies of each gene.

Sorry if this isn't a clear answer, but the offspring receives genes from its parents. Alone, the cells that the offspring has received duplicates, and they copy each other over and over.

Explanation:

-- You are 462 meters behind.

-- You're gaining on him at the rate of  (35m/s - 25m/s)= 10 m/s.

-- At that rate, it'll take you (462m / 10m/s)= 46.2 seconds to over take him.

-- During that time, you'll cover (46.2s x 35m/s)= 1,617 meters.