Carl will be ahead of Fred by 6 yards
EXPLANATION :
Betty - 22yds
Dan - 15yds behind Betty so he will be at 7yds
Edith - 11yds ahead of Dan so he will be at 18yds
Carl - 11yds ahead of Betty so he will be at 33yds
Fred - 20yds ahead of Dan so he will be at 27yds
Carl is 6yds ahead of Fred so 6yds is the answer