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180 km → ......tmenit
t / 30 = 180 /60
t = 180/60 x 30 = 3 x 30 = 90 menit
90 menit adalah 1,5 jam
s = 60 km
t = 30 menit = 0,5 jm
maka :
V = s/t
= 60/0,5
= 120 km/jm
jika s = 180 km
t = s/v
= 180/120
= 1,5 jm
= 1 jm 30 menit