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waktu=140/70km/jam=2jam
60 km/jam = 140 menit
70 km/jam = .......
perbandingan berbalik nilai
60/70 = a/140
6/7 = a/140
6 . 140 = 7 . a
a = 6 . 140 / 7
a = 6 . 20
a = 120 menit
a = 2 jam
jadi jawabanya B