A runner calculated her average speed during a half-marathon.
The average speed of the runner was 1.9 x 10^-3 kilometers per minute.
(Note: The average speed can also be expressed in other units, such as miles per hour, depending on the context.)
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A runner calculated her average speed during a half-marathon.
The average speed of the runner was 1.9 x 10^-3 blank per blank
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