The Common Denominator - Ends 17th April

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On Channel 4 I came across this program called 'The Common Denominator' it features two words or images that link together for some reason, thus have something in common. One for example was a picture of penicillin whereas the other was of Daniel Craig - the 'common denominator' here was 'Fleming' as Ian Fleming created James Bond and Alexander Fleming discovered penicillin. This gave me the idea for a competition. Below are 3 sets of words and you need to tell me what the common denominator is in them. Once you think you know the answers PM HabboxComps with them.

Good Luck!

1. Steam Train and Duck.
2. US State and Wimbledon Ladies' Champion.
3. Football and Tent.

Prize: 5 credits + 10 rep