Problem #9 MEDIUM
The Two Sand Hourglasses
Adobe Logic Lateral Thinking
Problem Statement
You need to boil an egg for exactly 9 minutes, but you do not have a clock or watch.
Instead, you have two hourglasses: one that measures exactly 4 minutes, and another that measures exactly 7 minutes.
How can you measure exactly 9 minutes using only these two hourglasses?
Answer & Quick Explanation
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