Which river originates from the Amarkantak plateau?

What is the value of positive square root of $(69+28\sqrt{5})$?

$3^{11}+3^{12}+3^{13}+3^{14}$ is divisible by ____.

Find the value of $\frac{1}{1+{\tan }^2\left(\theta \right)}+\frac{1}{1+{{\displaystyle \cot }}^2\left(\theta \right)}$

Find the value of $\sqrt{10+\sqrt{25+\sqrt{108+\sqrt{154+\sqrt{225}}}}}$

Two rifles are fired from the same place at a difference of $11\min$. $45$ scconds. But a man who is coming towards the same place in a train hears the sccond sound alter $11$ minutes. find the speed of the train (Assuming speed of sound $=330m/s$).

If $a+\frac{1}{a-2}=4$ , then the value of ${\left(a-2\right)}^2+{\left(\frac{1}{a-2}\right)}^2$ is:

The average of runs of a cricket player of $20$ innings was $32$. How many runs must he make in his next innings So as to increase his average of runs by $4$?