riddles and brain teasers

How does he do it?

A girl holds her breath underwater for 5 minutes, and is payed $100 by the magician. A boy comes, and claims he can stay under water for 10 minutes. He asks for $500.

The magician is made to pay, as the boy kept his word.

How does he do it ?

He stays under water for 1 minutes, comes back up, then goes back down. He does this continuously until his 10 minutes under the water are over.
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