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B 30 menit : 1 1/4 jam = 30 : 75 = 2 : 5 menit
:))
= 3 : 6 ...... bagi dengan 3
= 1 : 2
b) 30 menit : 1 1/4 jam = 30 menit : 75 menit ... bagi dgn 15 menit
= 2 : 5