posted by Kim .
bill and amy want to ride their bikes from thier neighborhood to school which is 14.4 kilometers away. It takes Amy 40 minutes to arrive at school. Bill arrives 20 minutes after Amy. How much faster is Amy's average speed fro the entire trip?
The entire trip for Amy would take 40 minutes there, 40 minutes back, 80 minutes total. Bill would take 60 minutes there and 60 minutes back, 120 minutes total. 80/120= 8/12= 4/6= 2/3 Which is approximately 67%. Hope this helped.