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15 - x = 40 ( 1/10 + t ) ( I )
15 - ( 60 t ) = 40 ( 1/10 + t )
15 - 60 t = 4 40 t
15 - 4 = 40 t + 60 t
11 = 100 t
11/100 jam = t
11/100 × 60 = t
= 6,66 menit
Maaf jika salah ya....