If Vivica typed a document at an average rate that was greater than

Interesting question. My take:

1) First of all, we're going to use the following relationship: \(Rate = \frac{Amount}{Time}\). Vivica writes \(\frac{3}{4}\) of the document in 42 minutes. This would indicate that, IF Vivica was typing at a uniform rate, her rate would be \(\frac{3}{4}\) * \(\frac{1}{42}\) which simplifies to \(\frac{1}{56}\).

2) Thus, if Vivica typed at a uniform rate, she would've completed the document in 56 minutes. However, we are only told that her average rate is above 90 words/minute, so technically she could've stayed above this average for the first 42 minutes and then dropped far below this average in the remaining minutes of her writing, which could've brought the total time consumed above 60 minutes (1 hour). Therefore, Statement 2 is vital to conclude that she is actually writing at a uniform rate and the correct answer choice is thus C.