Step-by-step explanation:
here's the solution: -
Average time taken by sarah :
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=》
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average time taken by sarah = 70.9 seconds
now,
average time taken by katie :
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=》
=》
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.
