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(6×45 menit) - (2×15 menit)
= 270 menit - 30 menit
= 240 menit
= (240/60) jam
= 4 jam
lama pembelajaran :
6 x 45 menit = 280 menit (4jam40menit)
istirahat:
2 x 15 menit = 30 menit
jadi total = 4jam40menit + 30 menit
= 5jam 10menit
semoga bermanfaat