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The problem asks for Kelly's knitting speed, in feet per hour, given that she knitted \( \frac{3}{8} \) of a foot in \( \frac{1}{3} \) of an hour.

To find the speed, we use the formula for speed:

\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
\]

Here, the distance is \( \frac{3}{8} \) feet, and the time is \( \frac{1}{3} \) hour. Therefore, the speed is:

\[
\text{Speed} = \frac{\frac{3}{8}}{\frac{1}{3}} = \frac{3}{8} \times \frac{3}{1} = \frac{9}{8} \text{ feet per hour}
\]

Now, we convert \( \frac{9}{8} \) into a mixed number:

\[
\frac{9}{8} = 1 \frac{1}{8}
\]

Thus, Kelly's knitting speed is \( 1 \frac{1}{8} \) feet per hour, which matches the last answer choice.

Let me know if you would like further details, or if you have any questions!

Here are five related questions to explore:
1. How would Kelly’s speed change if she knitted \( \frac{1}{2} \) foot in \( \frac{1}{4} \) of an hour?
2. How do you convert an improper fraction to a mixed number?
3. What is the relationship between speed, distance, and time?
4. How would Kelly's speed be affected if it took her twice as long to knit the same length of scarf?
5. How do you solve complex fraction divisions?

**Tip:** When dividing fractions, remember to multiply by the reciprocal of the second fraction.

Kelly is knitting a scarf for her brother. It took her 1/3 hour to knit 3/8 foot of the scarf. How fast is Kelly's knitting speed, in feet per hour?

Learn how to calculate Kelly's knitting speed by dividing fractions. Given that she knits 3/8 foot of a scarf in 1/3 hour, find her speed in feet per hour with a step-by-step solution.

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