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Pertama Pake rumus Q=m.c.selisih suhu dulu.
Kedua pke rumus w=p.t
350=2.80.4200.t
Lalu pindah ruas sendiri ya
P . t = m . c . Delta T
350 . t = 2 . 4200 . (100 - 20)
350t = 8400 . 80
350t = 672000
t = 672000 : 350t
= 1920 sekon
-> 1920 sekon = 1920 : 60 = 32 menit
Jadi jawabannya C. 32 menit