The graph drawn here depicts the last 75 sec of the competition between Ian Thorpe (Austra...

The graph drawn here depicts the last 75 sec of the competition between Ian Thorpe (Australia) and Massimiliano Rosolino (Italy) in the men’s 400-m freestyle at the 2000 Olympics, where a new Olympic record was set.

a. Who was in the lead at 180 sec? 210 sec?

b. In the last 50 m, how many times were they tied, and when did the ties occur?

c. About how many seconds did Rosolino have the lead?

d. Which swimmer won the race?

e. By approximately how many seconds?

f. Use the graph to approximate the new Olympic record set in the year 2000.