"What is the shortest distance between two
lines?"
I answered that based on the options, but all the options were pairs of adjacent
stations.
I'd argue that the shortest distance between lines is at any station where services of different lines call at the same platform face. Therefore, exactly 0in0ft. Such as Baker Street (H&C/Circle) or Westminster (District/Circle). Even the cross platform interchange between Bakerloo and Victoria lines at Oxford Circus is shorter than the distance between what I suspect was the quiz setter's intended answer for the above question.
And what the heck has Platform 9^ got to do with the Underground?
Despite at least 4 ambiguous questions I managed to get 18/20, with some inspired guesses in places. Missed out on the number of tube stations on a Monopoly board (slightly ambiguous - there's none on my Monopoly board - The Somerset Edition!) and the amount
TfL» charges per hour for filming on the tube.