Kathy and Diane speed walk for exercise. Kathy walks at 4 mph while Diane walks at 5 mph. They stand and talk at a corner, then Diane starts walking east and Kathy starts walking north. Which choice is closest to the distance
between them after 90 minutes? Hint: Distance = rate . time.
4.5 miles
o 9.5 miles
6.5 miles
13.5 miles
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