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t = 4 h
d = vt
d = (90)(4)
d= 360 km
a)
v = 10 km/h
d = 360 km
d = vt
t = d/v
t = 360/10
t = 10 horas
b)
t = 3 horas
d = 360 km
d = vt
v = d/t
v = 360/3
v = 120 km/h