To express the object's average speed using the formula \( r = \frac{d}{t} \), where \( d \) is the total distance in kilometers (km) and \( t \) is the total time in seconds (s), we can derive the units for average speed as follows:
- Distance \( d \) is measured in kilometers (km).
- Time \( t \) is measured in seconds (s).
When we calculate average speed \( r \):
\[ r = \frac{d}{t} = \frac{\text{km}}{\text{s}} \]
Thus, the units of average speed will be expressed as kilometers per second (km/s). Therefore, the engineer would express the object's average speed in kilometers per second (km/s).
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