Public transport in Warsaw - time tickets

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- Where can I purchase the 20 minutes time tickets for public transport in Warsaw?
- Can I get it in all of the Metro stations and in Bus? Can I pay by credit card?
- Can I buy it using vending machines?
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Guide to Public Transport Tickets in Warsaw
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: William Fortunato, Aleksandr Burzinskij, Ono Kosuki, Ono Kosuki