A submarine left the surface of the water at the rate of $-6$ feet per second. At that rate, how long would it take the submarine to reach $-180$ feet level?

Given: A submarine left the surface of the water at the rate of $-6$ feet per second.

To do: To find the time taken by submarine to reach $-180$ feet.

Solution:

Here, $-6$ feet means $6$ feet downward.

As given, time taken to reach $6$ feet downward$=1$ second

Time taken to reach $1$ feet downward$=\frac{1}{6}$ second

Time taken to reach $180$ feet downward$=\frac{1}{6}\times180=30$ second

Thus, the submarine will take $30$ second to reach $-180$ feet level.

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