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1 menit = 60 detik
3 2/3 jam = (3600 x 3) + (3600 x 2/3) = 10.800+ 2.400 = 13.200 detik
20 menit = 20 x 60 = 1200 detik
jadi 13.200+1.200-9.900= 4.500 detik
10.800 detik = 10.800 : 3600 = 3 jam
240 menit = 240 : 60 = 4 jam
3+4= 7 jm
20menit=20x60=1200detik
JAWAB:(13200+1200)-9900=4500detik (A)
10800detik=10800:3600=3jam
240menit=240:60=4jam
JAWAB:3+4=7jam (C)
Semoga bermanfaat ^_^