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80 km / jam = 3,75 jam
60 km / jam = x jam
60x = 80 * 3,75
60x = 300
x = 300 / 60
x = 30 / 6 jam
x = 5 jam
t= 3 jam 45 menit = 3 3/4 jam = 15/4 jam
s = v.t = 80.15/4 = 300 km
Jika v = 60 km/jam
t= s/v = 300 / 60 = 5 jam