Do You Know?
What is black when you get it, red when you use it, and grey when you’re through with it?
The answer is not this picture.
You have 2 sand-filled hourglasses. One is a 4-minute timer, and the second is a 7-minute timer. How do you use both timers to measure 9 minutes?
Post your answers in the comments section. We’ll update with answers soon…