Answer
216/15625
Work Step by Step
When a fraction is raised to a power, we distribute the power to everything in the numerator and denominator of the fraction. Also, recall when a power is raised to a power, we multiply the two powers to get the new power (exponent). Thus, we obtain:
$(6/5^{2})^{3}=6^{3}/5^{6}=216/15625$