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t = 2 jam
V = 70 km/jam
maka :
s = V x t
= 70 x 2
= 140 km
agar dapat ditempuh selama 1 jam 45 menit = 1,75 jam, maka :
V = 140 / 1,75
= 80 km/jam
jadi kecepatan mobil harus 80 km/ jam