no 15 beserta cara nya

1 jam 23 menit 18 detik
= 60 menit + 23 menit + 3/10 menit
= 83 3/10 menit

1 jam 36 menit 42 detik
= 60 menit + 36 menit + 7/10
= 96 7/10 menit

83 3/10 menit + 96 7/10 menit
= ((83 + 96) + (3/10 + 7/10)) menit
= (179 + 1) menit
= 180 menit
= 3 jam

17 : 30 - 03 : 00
= 14 : 30

Jawaban : A. 14 : 30

Maaf Kalau Salah