<prompt> Translate the following text to EnglishNi wazi kwamba hangeweza kuwafuata wote wawili isipokuwa kama Boris, angetazama saa, na kisha angetazama ubao wa matangazo ya treni.  <response>: Obviously, he could not follow both of them unless Like Boris, he glanced up at the clock, and then to the announcement board of the trains. 