<p>That formula is to find the harmonic mean.
This formula is very useful in the average speed questions that are so frequently asked in the SAT.
Divide by two? I think its multiply by two to find the total distance covered.</p>
<p>That formula is to find the harmonic mean.
This formula is very useful in the average speed questions that are so frequently asked in the SAT.
Divide by two? I think its multiply by two to find the total distance covered.</p>