A submarine descends at the rate of $2$ m per minute. If it starts its descent from $30$ m below the sea level, then how long will it take to reach $210$ m below the sea level$?$

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$1.$ Integer that has no opposite is _____.

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$2.$ _____$÷\left(-10001\right)=0$

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$3. \left(-16\right)+\left(-8\right)\times \left(-4\right)÷\left(-2\right)=$ _____.

$\left\{\left(-104\right)+\left(-56\right)\right\}÷\left(104+56\right)=$_____.

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$1.$Additive identity element in set of integers is:

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$2.$Division of any integer with respect to which of the following is not possible.

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$3. \left(-4\right)\times \left(-3\right)\times 0\times 3\times 4$ is equal to: