Translation:Are taxis fast?
You technically do not know. Japanese can be very ambiguous relative to other languages because plurality, and even subjects, are often not stated explicitly but must be inferred from context. For example, the simple sentence "oyogimasu" can mean "i swim," "he swims," "she swims," "they swim," "i will swim," "he will swim," "she will swim," or "they will swim." 8 possible meanings for one word, since the subject is not specified and that form can indicate present or future tense. Context would be necessary to determine the exact meaning.