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Vpergi = 60 km/jm
t = 1,5 jm
maka :
S = v x t
= 60 x 1,5
= 90 km
Jika V pulang = 80 km/jam
maka :
t = s/v
= 90/80
= 1,125 jam
= 1 jam 7,5 menit