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