A long-distance runner wishes to calculate her average speed for a race.
Which calculation should she use?
$average{\text{ }}speed{\text{ }} = \frac{{total{\text{ }}distance}}{{total{\text{ }}time}}$
2 )
average speed = total distance × total time
3 )
$average{\text{ }}speed{\text{ }} = \frac{{total{\text{ }}time}}{{total{\text{ }}distance}}$
4 )
average speed = total distance + total time
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