Answer
$\displaystyle \frac{3k}{5}$
Work Step by Step
$\displaystyle \frac{9k^{2}}{25}\cdot \displaystyle \frac{5}{3k}= \qquad$... apply property: $\displaystyle \frac{P}{Q}\cdot\frac{R}{S}=\frac{PR}{QS}$
Write 9 as $3\cdot 3$,
25 as $5\cdot 5$ ( we will reduce what we can)
=$\displaystyle \frac{3\cdot 3\cdot 5k^{2}}{5\cdot 5\cdot 3k}= \qquad$... reduce: 3, 5, k
$= \displaystyle \frac{3k}{5}$
