Question

divide the sum of 65/12 and 12/7 by their difference

Answer 1

Sum of $\frac{65}{12}$ and $\frac{12}{7}$ = $\frac{599}{84}$
Difference between $\frac{65}{12}$ and $\frac{12}{7}$ = $\frac{311}{84}$

Dividing their sum by their difference
$\frac{ \frac{599}{84} }{ \frac{311}{84} }$
$= \frac{599}{84} * \frac{84}{311}$
$= \frac{599}{311}$

Hope this may help you.