Kim is driving from Miami to Key West. The graph shows her distance from Key West. During which interval is Kim driving the fastest?

0 - 2 hours shows driving the fastest
Distance traveled divided by Time taken provides speed of vehicle.
Kim travels 160 to 40 miles in 2 hours
hence speed =160-40/2=120/2
hence 60 miles /hr
Then Kim travels 40 miles in1.5 hours
hence speed = 40/1.5hr
= 26.66 miles /hr
Hence, Kim drives fastest in first 2 hours.
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