Mathematics, 03.07.2019 06:00, dekhua

Seraphina is driving two hours to visit her family. for the first hour, she traveled at a speed of 61 miles per hour. then, in the second hour, she traveled at a speed of 72 miles per hour. what is the percentage increase of seraphina's speed?

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Seraphina is driving two hours to visit her family. for the first hour, she traveled at a speed of 6...