Container Filling in Rain

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?




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After the last person has done what he wanted, which bulbs will be lit and which ones will be switched off?

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In the 1920s, people feared that crossword puzzles would contribute to illiteracy.