Juanita wants to participate in a 20 kilometer bicycle race. she is considering two training programs below.
program a: ride 10 kilometers on the first day and increase the distance by 500 meters each day.
program b: ride 7,500 meters on the first day and increase the distance by an additional 0.75 kilometer each day.
if juanita chooses program a, on which day will she ride 15 kilometers for the first time?

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?