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To find Riley's hourly rate, we need to divide the amount she earned ($5) by the fraction of an hour she worked.
The fraction of an hour Riley worked is 1/2.
We can write the division of $5 by 1/2 as a fraction:
$5 รท 1/2 = $5 ร 2/1 = $10
Therefore, Riley's hourly rate is $10 per hour.