Henry challenges emile to a walking race. Because emile's walking rate is faster, emile gives Henry a 45-meter head start.

Henry challenges emile to a walking race. Because emile's walking rate is faster, emile gives Henry a 45-meter head start. emile knows his brother would enjoy winning the race, but he does not want the race so short that it is obvious his brother will win. How long should the race be so that Henry will win in a close race?