There are $3$ clocks in a shop. One climes after every $5$ minutes, the second after every $15$ minutes and third after every $30$ minutes. If all of them have climed at $10 \mathrm{o}\text{'}\mathrm{clock}$ for how many hours they all again clim (at what time)$?$ If the answer is $K \text{minutes}$, write the value of $K$ in the answer box.

What is the LCM of $x^3+8$, $x^2+5x+6$ and $x^3+4x^2+4x$ ?

What is the number of Prime factor in ${15}^{18}$$\times$$4^{10}$$\times$$6^9$.

The sum of all the factors of $156$ is: 
(A) $392$
(B) $235$
(C) $390$
(D) $379$

The total number of factors of 1156 is: 

(A) 9 

(B) 8 

(C) 10 

(D) 11 

The prime factorisation of 240 is:

(A) $2^3\times$$3^2\times 5$ 

(B) $2^4\times 3^2\times 5$

(C) $2^4\times 3\times 5$

(D) $2^5\times 3\times 5$