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v = 20 km/jm
t = 4 jm
maka :
s = v x t
= 20 x 4
= 80 km
jika v = 50 km/jm
t = s/v
= 80/50
= 1,6 jm
= 1 jm 36 menit
80 km : 50 km/jam = 1 jam 3/5
=1 jam 36 menit