Step-by-step explanation:
here's the solution: -
Average time taken by sarah :
=》

=》

=》

average time taken by sarah = 70.9 seconds
now,
average time taken by katie :
=》

=》

=》

average time taken by katie = 78.9 seconds
so, sarah is more efficient (faster) than katie.
i agree with sarah.
cuz, she took less time than katie.
The answer is 604.235378543
You just need to find distance between two points
d=

d=6