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2 jam = 2 x 60 = 120 menit
1 detik = 1/60 menit
900 detik = 900/60 = 15 menit
maka:
2 jam + 20 menit + 900 detik
= 120 menit + 20 menit + 15 menit
= 155 menit
2jam 120 menit
900 detik 15 menit
120+20+15=155