91Ó°ÊÓ

One gardener can mow a golf course in 4 hours, while another gardener can mow the same golf course in 6 hours. How long would it take if the two gardeners worked together to mow the golf course?

Simplify the rational expression $\frac{36v^3{w}^2}{27v{w}^3}.$

In the following exercises, add.

$\frac{3s^2}{3s-2}+\frac{13s-10}{3s-2}$

In the following exercises, add.

$\frac{2w^2}{w^2-16}+\frac{8w}{w^2-16}$

In the following exercises, add.

$\frac{7x^2}{x^2-9}+\frac{21x}{x^2-9}$

In the following exercises, subtract.

$\frac{9a^2}{3a-7}-\frac{49}{3a-7}$

In the following exercises, subtract.

$\frac{25b^2}{5b-6}-\frac{36}{5b-6}$

In the following exercises, subtract.

$\frac{3m^2}{6m-30}-\frac{21m-30}{6m-30}$

In the following exercises, subtract.

$\frac{2n^2}{4n-32}-\frac{18n-16}{4n-32}$

In the following exercises, subtract.

$\frac{6p^2+3p+4}{p^2+4p-5}-\frac{5p^2+p+7}{p^2+4p-5}$