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The problem in the image asks:

**"It took a submarine 20 seconds to drop to 100 feet below sea level from the surface. What was the rate of the descent?"**

To find the rate of descent, we use the formula for speed (rate):

\[
\text{Rate of descent} = \frac{\text{Distance}}{\text{Time}}
\]

Here:
- The distance is 100 feet.
- The time is 20 seconds.

So, the rate of descent is:

\[
\text{Rate of descent} = \frac{100 \, \text{feet}}{20 \, \text{seconds}} = 5 \, \text{feet per second}
\]

Thus, the submarine's rate of descent is **5 feet per second**.

Would you like any further details or explanations?

Here are five related questions to explore:
1. How would the rate of descent change if the submarine took 30 seconds to descend 100 feet?
2. What is the average rate of ascent if the submarine rose back to the surface in 25 seconds?
3. If the submarine continued descending at 5 feet per second, how deep would it be after 40 seconds?
4. How long would it take the submarine to reach 200 feet below the surface at the same rate?
5. What would the rate of descent be in feet per minute?

**Tip**: Always double-check units when calculating rates to ensure consistency.

It took a submarine 20 seconds to drop to 100 feet below sea level from the surface. What was the rate of the descent?

Learn how to calculate the rate of descent for a submarine that took 20 seconds to drop 100 feet below sea level. This problem covers key concepts in speed calculation and is suitable for students in Grades 6-8.

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