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1.800 detik = 1/2 jam / 30 menit
Jadi, 2 jam - 2 jam + 1/2 jam = 1/2 jam
Semoga Membantu :-)
1.800 detik = 0,5 jam
jadi 2 jam - 120 menit + 1.800 detik=
= 2 jam-2jam+0,5jam
=0,5 jam atau 30 menit