$3 t^{2}+2 t^{2}=6^{2}$
Final Answer: \(\boxed{2.6832815729997477}\)
Step 1 :Simplify the equation $3 t^{2}+2 t^{2}=6^{2}$ to $5t^{2} = 36$
Step 2 :Divide both sides of the equation by $5$ to get $t^{2} = 7.2$
Step 3 :Take the square root of both sides to solve for $t$, $t = \sqrt{7.2}$
Step 4 :Calculate the square root of $7.2$ to get the final answer
Step 5 :Final Answer: \(\boxed{2.6832815729997477}\)