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= 1800 +30 = 1830 detik
d. 900 detik + 45 menit = 900 + 45 × 60
= 900 + 2700 = 3600 detik
1/2 menit = 30 detik
1.800 detik + 30 detik = 1.830 detik
d. 900 detik = 900 detik ÷ 3.600 detik
= 0,25 jam
45 menit = 45 menit ÷ 60 menit
= 0,75 jam
0,25 jam + 0,75 jam = 1 jam