Question

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Answer 1

t=tempo
v=velocidade

v=∆s/∆t
∆s=v.∆t
∆s=v.t
∆s=80.t

∆s=60.(2-t)
∆s=120-60t

120-60t=80t
120=140t
t=120/140
t=12/14
t=6/7 h

∆s≈69 km

$\boxed{ \boxed{ \boxed{ \mathsf{69 \: km}}}}$