Which of the following is the most appropriate unit to describe the rate at which a person reads?
A. words per minute, because the independent quantity is the words.
B. words per minute, because the independent quantity is the minutes.
I think the best answer from the choices listed above is option B. The most appropriate unit to describe the rate at which a person reads would be words per minute, because the independent quantity is the minutes. Time cannot be manipulated so it must be the independent quantity.
