Find the difference of product formed by $\frac{-17}{19} \mathrm{and} \frac{34}{3}$ and their quotient.

A man walks $\frac{7}{12} \mathrm{km}$ towards north. From there, he moves back towards south and covers$\frac{5}{18} \mathrm{km}$. Find the total distance covered by him. Also, find in which direction did he travel more and by how much.

Find the missing rational number.

$\frac{2}{3}+\left(\frac{-4}{5}\right)+\left(\frac{-11}{5}\right)+$ _____ $=-3$

Find the missing rational number.

$\frac{-3}{5}+\left(\frac{-7}{10}\right)+$ _____ $=\frac{-9}{5}$

If $x=\frac{7}{9}, y=\frac{-5}{18}, z=\frac{-4}{15}$, then find reciprocal of $\left(x+y\right)-z$.

If $x=\frac{7}{9}, y=\frac{-5}{18}, z=\frac{-4}{15}$, then find $\left(x÷y\right)\times z+\left(y÷z\right)\times x+\left(z÷x\right)\times y$.

$\frac{1}{2}+\left(\frac{-1}{3}\right)=\left(\frac{{\displaystyle -1}}{{\displaystyle 3}}\right)+$ _____

$\frac{-99}{100}+$ _____ $=\frac{-99}{100}$