To solve the problem, we start by establishing the initial depth of the fish and the target depth.
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Initial Depth of the Fish: \[ \text{Initial Depth} = -10.8 \text{ meters} \]
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Target Depth: \[ \text{Target Depth} = -37.8 \text{ meters} \]
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Depth Change: The fish descends typically 1.5 meters every 2 minutes. We need to find out how much deeper the fish needs to go to reach the target depth.
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Calculate the Required Descent: \[ \text{Required Descent} = \text{Target Depth} - \text{Initial Depth} \]
\[ \text{Required Descent} = -37.8 - (-10.8) = -37.8 + 10.8 = -27.0 \text{ meters} \]
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Calculate Time Needed: Since the fish descends 1.5 meters every 2 minutes, we need to find how many segments of 1.5 meters fit into the required descent of -27.0 meters.
\[ \text{Number of descents} = \frac{27.0}{1.5} = 18 \]
Since it takes 2 minutes for each descent of 1.5 meters:
\[ \text{Total Time} = 18 \times 2 = 36 \text{ minutes} \]
Conclusion:
It will take the fish 36 minutes to reach a depth of -37.8 meters.
Explanation:
This means that starting from a depth of -10.8 meters, the fish will continue to descend at a rate of 1.5 meters every 2 minutes, and after 36 minutes, it will be at a depth of -37.8 meters, which is 27 meters deeper than its initial position.