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v = s/t
36 = S / 2,5
S = 2,5 x 36 = 90 km
t berkurang 1 jam, t = 2,5-1=1,5jam
v = S /t
v = 90km/ 1,5jam= 60km/jam
Waktu = 3/2 jam
90 : 3/2 = 90 x 2/3 = 60 km/jam