At what time between 1 and 2 o'clock are the hands of the clock exactly 90 degrees apart?
Category: Math · Difficulty: hard
Hint: Consider the angles created by the hour and minute hands.
Answer
1:45
Explanation
The minute hand moves at 6 degrees per minute and the hour hand at 0.5 degrees. Solving gives 1:45.
This is a hard math riddle — a tricky one that takes a little thought. The answer is 1:45.
More Math riddles
- If an hourglass runs out in 30 minutes, how many minutes are left after it has run for 10 minutes?
- Three siblings are 2, 4, and 6 years old. What is their average age?
- If a glass has 3 liters of water and you pour out 2 liters, how much water is left?
- What number comes after 9?
- I am a fruit that can be divided to get the same number. What am I?
- What number is silent but can make a loud statement?
- I have rungs but I'm not a ladder. I can be tall or short, what am I?
- I am a box with no corners, what am I?