The teacher gave the following puzzle to students:

A container holds the equivalent of $30$ glasses of water. If the tap on it is turned with a uniform speed, it takes $10 s$ to fill a glass of water. How long will the container take to be emptied, if the tap is kept open?

Four different options come from students. They were

Visiting the historical monuments, a tourist asked "How old is this monument"? The guide replied, "The monument's exact age was a square number two years ago, and will be a cube number after two years". What is the age of this historical monument?

Today, the age of the mother is thrice as that of her daughter. After $12 years$, the age of the mother will be twice that of her daughter. The present age of the daughter is 

I have a few sweets to be distributed. If I keep $2, 3 or 4$ in a pack, I am left with one sweet. If I keep $5$ in a pack, I am left with none. What is the minimum number of sweets I can pack and distribute?

A train running at $60 km/h$ or a car speeding at $100 m per 6 sec.$ What runs faster?

In the following multiplication problem, find the numerical values of $T, F \& H$ in that order

$\begin{array}{ccccccc}& & L& T& B& D& F\\ & & & & & 4& 6\\ & 3& 4& T& G& F& T\\ 2& 3& D& 4& H& D& \\ D& 6& L& F& 6& L& 8\end{array}$

Given, the following addition problem, find the number $NET$ in digits.

$\begin{array}{ccccc}& & N& O& T\\ +& T& O& N& E\\ & 9& 0& 0& 0\end{array}$

Given that $LOT+TO=8$. Find out which of the following does not stand for $TOL$ to fulfil the above equation.

Given the following subtraction problem, find out which of the following numbers does not stand for $LENS?$

$\begin{array}{cccc}& L& E& N\\ -& E& N& S\\ & 2& 2& 2\end{array}$