Part A — Reading Clocks & 24-Hour Time
The same moment can be written two ways. 12-hour time uses am and pm; 24-hour time counts straight through to 23:59. After midday, add 12 to the hour: 1 pm becomes 13:00.
1
Write the time shown on each clock, then write it in 24-hour time as if it were in the afternoon/evening.
A: →
B: →
C: →
2
How much time passes from the time on clock A to the time on clock C (same afternoon)?
3
A film starts at the time on clock B and lasts 1 hour 45 minutes. What time does it finish?
Answer:
4
Complete these conversions.
(a) 90 minutes = hours minutes
(b) 2½ hours = minutes
5
Rewrite each 24-hour time as a 12-hour time with am or pm: 14:30, 06:05, 23:15.
6
Reasoning. Give one real situation where 24-hour time avoids confusion that 12-hour time could cause.
Part B — Elapsed Time & Timetables
Elapsed time is how long passes between a start and an end. A good trick is to count up to the next whole hour first, then add the remaining hours and minutes.
1
A bus leaves at 8:50 am and arrives at 9:35 am. How long is the journey?
Answer:
2
Use the timetable to answer the questions.
| Stop | Departs |
|---|---|
| Central | 09:15 |
| Riverside | 09:48 |
| Hilltop | 10:25 |
(a) How long from Central to Riverside?
(b) How long for the whole trip, Central to Hilltop?
3
A train leaves at 13:20 and the trip takes 2 hours 40 minutes. What time does it arrive (24-hour time)?
Answer:
4
Add these two durations: 1 h 50 min + 2 h 25 min.
Answer:
5
Work backwards. You must arrive by 5:00 pm. The journey takes 1 hour 35 minutes. What is the latest time you can leave?
6
Plan it. You wake at 7:00 am. Breakfast takes 20 min, getting ready 25 min, and the walk to school 15 min. What time do you arrive? How much spare time before the 8:30 am bell?