Use integers to describe each idea .
$15 s e c$ to blast off the old building.

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Solution

Here, In the given sentence, $15 s e c$ to blast off the old building means there is $15 s e c$ remaining for the blast.
So it will be shown by negative sign.
Final Answer : $15 s e c$ to blast off the old building = $- 15 s e c$ .

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Use integers to describe each idea .15sec to blast off the old building.

Here, In the given sentence,15sec to blast off the old building means there is 15sec remaining for the blast.So it will be shown by negative sign.Final Answer : 15sec to blast off the old building = -15sec.

Use integers to describe each idea .
$15 s e c$ to blast off the old building.

Here, In the given sentence, $15 s e c$ to blast off the old building means there is $15 s e c$ remaining for the blast.
So it will be shown by negative sign.
Final Answer : $15 s e c$ to blast off the old building = $- 15 s e c$ .