Rani belajar IPA 1 2/5 jam, dilanjutkan belajar matematika 1,2 jam. Berapa lama Rani belajar?

1 2 / 5 jam = 7 / 5 jam
=> 7 / 5 × 60 = 84 menit

1,2 jam = 12 / 10 jam
=> 12 / 10 × 60 = 72 menit

= 84 menit + 72 menit
= 156 menit
= 2 jam + 36 menit