1000m = 1km, so 5km = 5,000m. 5,000m + 8m = 5,008m. Or 5.008km.
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convert to equal units, then do the math.
5000 m + 8 m = 5008 meters
or
5 km + 0.008 km = 5.008 kilometers
5000 m + 8 m = 5008 meters
or
5 km + 0.008 km = 5.008 kilometers