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Verified answer
Mapel : MatematikaBab : Perbandingan
Perbandingan Berbalik Nilai
2 jam 30 menit = 2 1/2 jam = 5/2 jam= 40 km/jam
1 jam 20 menit = 1 1/3 jam = 4/3 jam = x
5/2 / 4/3 = x / 40
x = 5/2 x 40 : 4/3
x = 5 x 20 x 3/4
x = 5 x 5 x 3
x = 75 km/jam
Jadi, kecepatan kereta tersebut adalah 75 km/jam