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v₂=72km/h=20m/s
v₁=54km/h=15m/s
v=v₂-v₁
s/t=v₂-v₁ / ×t
s=t×(v₂-v₁) / ÷(v₂-v₁)
t=s÷(v₂-v₁)
t=1000÷(20-15)
t=1000÷5
t=200s
pozdrawiam;]