PLZ HELP!!!!!!!!!!!!!!!!! LOTS OF POINTS!!!!

There are 6 racers who went on a 25 meter race!!
X=time in seconds
Y=distance in meters

1) The winner race D (line purple) won the race in 9.6 seconds! Equation for line y=2.5x+1
How fast was this person traveling? Write in unit rates

2) what would the graph look like if one of the riders fell off their tricycle