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1/2 menit = 1/2 × 60 = 30 detik
jadi 1800 + 30 = 1830 detik
d. 900 detik = 900 ÷ 60 = 15 menit
45 + 15 = 60 menit = 1 jam
0,5×3.600=1.800
0,5×60=30
jawab=1.800+30
=1.830
d.900 detik= 0,25 jam
45 menit= 0,75 jam
jawab=0,25 + 0,75
=1