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3/4 jam = 45 menit
sisa waktu = 150-45 = 105
waktu belajar u/ tiap pelajaran = 105/3 = 35
1/2 jam = 30 m
3/4 jam = 45 m
jdi , 60×2+30-45m = 105 m
105 / 3 = 35 m
jadi
Waktu belajar matematika = 45m 3/4 jam
Waktu belajar untuk pelajaran yang lain = 35m