Ethan added food to his tortoise's food bowl, and 10 seconds later the tortoise started walking toward its bowl. When it was 12 centimeters away from the bowl, the tortoise was
moving toward its food at 7.5 centimeters per second. If its velocity stayed the same, how
long did it take the tortoise to reach the food bowl?

The answer to this is the 3rd choice!

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Answerthe half-reaction having the greatest tendency to occur at the anode:     i₂(aq) + 2e⁻  ⇄ 2i⁻  ;   e = +0.53 v======oxidation occurs at the anode. we must therefore find the half-reaction with the greatest tendency to oxidize.the given values of e are reduction potentials (the form of the half-reactions are of reduction).the lower the reduction potential, the higher the potential to oxidize. the half-cell with the lowest reduction potential will have the greatest tendency to oxidize at the anode.the half-reaction having the greatest tendency must be    i₂(aq) + 2e⁻  ⇄ 2i⁻    e = +0.53 vbecause its reduction potential is the lowest out of the three.