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harga 1 kg adalah rp 3.200.00
rp 3.200.00x18=57.00.00
3x = Rp9.600
x = Rp3.200
Jadi, 18kg adalah 18 x Rp3.200 = Rp57.600
2) s1/t1 = s2/t2
5/40 = s2/60
40s2 = 300
s2 = 7,5 km