Answer:
Jill's best friend jumped 8/21 feet further than Jill.
Explanation:
we have that
Jill jumped 6 1/3 feet
Jill best friend jumped 6 5/7 feet
To find out how much farther did Jill's best friend jumped, subtract the length that Jill jumped from the length that Jill best friend jumped
but first convert mixed number to improper fraction
substitute the values
therefore
Jill's best friend jumped 8/21 feet further than Jill.