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d = v*t
si d = 800 m y t = 140 s
v = d/t
v = 800/140 m/s
v = 40/7 m/s
1 km = 1000 m
x km = 40 m
1000x = 40
x = 0,04 km
1 h = 3600 s
x h = 7 s
3600x = 7
x = 0,00194 h
por tanto
v = 0,04/0,00194 km/h
v = 100/63 km/h