Question

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?

Answer 1

9/8 per hour
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Answer 2

`(9)/(8)` feet per hour fast is Kelly's knitting speed

Explanation:

Unit rate defined as the rates are expressed as a quantity 1 such as 4 meter per seconds or 4 miles per hour.

As per the statement:

Kelly is knitting a scarf for her brother. it took her 1/3 hour to knit 3/8 foot of the scarf.

She took /3 hour to knit 3/8 foot of the scarf.

Then by definition of unit rate we have;

`\text{Unit rate per hour} = ((3)/(8) )/((1)/(3) ) =(3)/(8) \cdot 3 = (9)/(8)` feet

Therefore,
`(9)/(8)` feet per hour fast is Kelly's knitting speed.