Translation:Is it slow?
"Are you late?", "Am I late?", "Is he/she late?" etc. are all correct answers.
Duolingo provides no context, which you need to translate Japanese, but then only accepts contextual answers. This frustrates me a lot.
Yes! If you were walking up to a stop with a friend and saw more people waiting there than usual, you could say this to your friend. You'd say it with more surprise if it were a subway or train
I wrote "Are you slow?" lol. Although it sounds rude but the lack of context/topic leaves a lot of options in this sentence.
Depends on the context. You might tell a junior (or peer for that matter) "ゆっくり食べてね". "遅い食事" is a kind of slow foods diet. The first is to eat slowly (and by context with more grace or patience).
I undestood that without a subject the meaning also could be "Am I late?" Am I wrong?!? :-)
Oh come on! You've been teaching me all these new words, car train, airport, bicycle, subway and all the different ways to travel... and then you just randomly throw words like near and slow at me and expect me to get it just like that? Whhhhhhy?!!?