Three friends $\text{A}$, $\text{B}$ and $\text{C}$ start running around a circular stadium and complete a single round in $24\text{ seconds}$, $36\text{ seconds}$ and $30\text{ seconds}$ respectively. After how many minutes will they meet again at the starting point?

To find the time when they will meet again at the starting point, we need to find the Least Common Multiple ($\text{LCM}$) of their individual round timings: $24,36,$ and $30\text{ seconds}$.
Step 1: Prime factorization of the numbers:

* $24=2^3\times 3^1$
* $36=2^2\times 3^2$
* $30=2^1\times 3^1\times 5^1$

Step 2: Find the $\text{LCM}$ by taking the highest powers of all prime factors involved:

$$\text{LCM}(24,36,30)=2^3\times 3^2\times 5^1=8\times 9\times 5=360\text{ seconds}$$

Step 3: Convert the time from seconds into minutes:

$$\text{Time in minutes}=\frac{360}{60}=6\text{ minutes}$$

Thus, they will meet again at the starting point after $6\text{ minutes}$.