You can put this solution on YOUR website! s = d/t
d = st
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d = 12.8 km/hr * 18 seconds
d = 12.8 km/hr * (1/(60*60) hr/second) * 18 seconds
d = 0.064 km
d = 0.064 km * (1000 m/km)
d = 64 meters
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