b) If you can consistently run 80 m in 16 s, how long will it take you to run 400 m? $$ \frac{400 \mathrm{~m}}{16 \mathrm{~s}} = 25 $$

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Let's determine how long it will take you to run **400 meters** based on your consistent performance of **80 meters in 16 seconds**.

### Step 1: Calculate Your Speed

First, find out your running speed using the formula:

$$
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
$$

Plugging in the values:

$$
\text{Speed} = \frac{80\, \text{m}}{16\, \text{s}} = 5\, \text{m/s}
$$

So, your running speed is **5 meters per second**.

### Step 2: Determine the Time to Run 400 Meters

Next, use your speed to find out how long it will take to run 400 meters:

$$
\text{Time} = \frac{\text{Distance}}{\text{Speed}}
$$

$$
\text{Time} = \frac{400\, \text{m}}{5\, \text{m/s}} = 80\, \text{seconds}
$$

### Conclusion

It will take you **80 seconds** to run **400 meters** at a consistent speed of **5 meters per second**.

### Note on Your Calculation

You calculated:

$$
\frac{400\, \text{m}}{16\, \text{s}} = 25
$$

This computation gives a rate of **25 meters per second**, which doesn't align with your initial speed of **5 meters per second**. Instead, by using the correct formula for time based on constant speed, we arrive at the accurate duration of **80 seconds** for running 400 meters.
It will take 80 seconds to run 400 meters at a speed of 5 meters per second.

b) If you can consistently run 80 m in 16 s, how long will it take you to run 400 m? \( \frac{400 \mathrm{~m}}{16 \mathrm{~s}} = 25 \)

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