IMO Practice Test — Time
6 Questions • 12 min • Olympiad level
12:00
Question 1 of 6
medium
What is 20:15 in 12-hour time?
8:15 p.m.
8:15 a.m.
10:15 p.m.
2:15 p.m.
Explanation: 20 − 12 = 8, after noon → 8:15 p.m.
Question 2 of 6
medium
Write 11:30 p.m. in 24-hour time.
23:30
11:30
13:30
00:30
Explanation: 11 + 12 = 23 → 23:30.
Question 3 of 6
medium
From 10:50 a.m. to 1:20 p.m. is how long?
2 hours 30 minutes
3 hours
2 hours
2 hours 50 minutes
Explanation: 10:50 to 1:20 p.m. (13:20) = 2 h 30 min.
Question 4 of 6
medium
How many weeks are there in 28 days?
4
3
7
2
Explanation: 28 ÷ 7 = 4 weeks.
Question 5 of 6
hard
A year that is NOT a leap year has how many extra days beyond 52 full weeks?
1
2
0
7
Explanation: 52 × 7 = 364, and 365 − 364 = 1 extra day.
Question 6 of 6
medium
A class is 45 minutes long and starts at 11:30. When does it end?
12:15
12:00
12:30
11:75
Explanation: 11:30 + 45 min = 12:15.