Mathematics for IGCSE & O level - Time (Section 1 - No. 40)
Joe set his digital recorder to switch on at 8:35 p.m. and switch off at 10:20 p.m. How long was the recorder on?
1 hour 45 minutes
1 hour 35 minutes
2 hours 15 minutes
2 hours 20 minutes
Giải thích
From 8:35 p.m. to 9:00 p.m. is 25 minutes. From 9:00 p.m. to 10:00 p.m. is 1 hour. From 10:00 p.m. to 10:20 p.m. is 20 minutes. Total time = 25 minutes + 1 hour + 20 minutes = 1 hour 45 minutes.