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30.000 : 15.000 = 2 : 1
b) 2jam = 120meit = 7200 detik
7200 : 80.000 = 9 : 100
c) 2 ton = 2000kg
2000 : 200 = 10 : 1
d) 10hari = 240jam
240 : 24 = 10 : 1