In Mr. Chang's class, Jack found out that his walking rate is 2.5 meters per second. That is, Jack walks 2.5 meters every 1 second. When he gets home from school, he times his little brother
Henry, as Henry walks 100 meters. He figures out that Henry's walking rate is 1 meter per
second. Henry walks 1 meter every second.
Henry challenges Jack to a walking race. Because Jack's walking rate is faster, Jack gives Henry
a 45-meter head start. Jack knows his brother would enjoy winning the race, but he does not
want to make the race so short that it is obvious his brother will win.
I
A How long should the race be so that Henry will win in a close race?
B Describe your strategy for finding your answer to Question A. Give evidence to support your
answer