Riddles, one at a time
Mirror Clock: The Long Wait
4 hours 11 minutes
16:61, 17:71, 18:81 and 19:91 are not real times. The next is 20:02, 4 h 11 min after 15:51.
Old Phone Keys: 4663
Which of the four words types 4663?
Find each digit's letters on the keypad. Only one of the four fits.
HOME
H is on 4, O on 6, M on 6, E on 3: 4663.
Flip-Flop Gates
Gates start as shown and flip after each box. Where does box 3 land?
BIN C
After boxes 1 and 2, box 3 goes left, right, right.
Which Tank Fills?
E
The cap stops A. Water takes each lowest open pipe: B, then D, then E.
Two Candles: Twice as Tall
Two candles of the same height are lit together and burn at a steady rate. A lasts 4 hours, B lasts 6 hours. After how many hours is B twice as tall as A?
A loses a quarter of its height each hour, B loses a sixth.
3 hours
After 3 h, A has 1/4 left and B has 1/2 left: twice.
Hands Apart: 9:45
What is the SMALLER angle between the hands?
The hour hand moves 30° each hour. How far has it gone after 45 minutes?
22.5°
The minute hand is on 9; the hour hand is 3/4 of the way to 10: 3/4 × 30° = 22.5°.
Scroll for the next riddle