bapak mulai membaca koran pukul 11.45 dan berhenti membaca pukul 13.25 bapak membaca selama ... menit

11.45-13.25
= 11.45-12.00 = 15 menit
12.00-13.25 = 85 menit
---------------- +
= 100 menit

13.25 - 11.45 = 1 jam 40 menit
1 jam = 60 menit

60 + 40 = 100 Menit

Semoga terbantu