MediumMath and Logic
Double every 5m. 1 fills in 12h. Time for 2 to fill?
Riddle
Double every 5m. 1 fills in 12h. Time for 2 to fill?
Choose an answer
A.6 hours
B.12 hours
C.11 hours
D.11h 55m
Hint: It's a 2-word phrase with 2 letters, starting with "1".
Answer
11h 55m
Why this is the answer
Starting with 2 is exactly where the 1-bacterium pond would be after 5 minutes (first doubling). So it saves 5 minutes off the 12-hour total.
This riddle is filed under Math Riddles and rated Medium.