I am assuming that in the first sentence, distance is mentioned to prompt the writer to convert meters into yards or feet. Four hundred meters is about 437 yards. A rewrite might say, "Alice parked her car about 440 yards from the hotel." You could also say "Alice parked her car about 1,300 feet from the hotel." You might, additionally, say, "Alice could not get close to her hotel, so parked about four and half football fields away." However, if your instructor simply wants you to reword the sentence to use the word distance, you could write, "Alice parked her car at a distance of 400 meters from the hotel."
In the second sentence, if you simply need to use the word revelations, you could write: "Today's newspaper contained some interesting revelations about global warming". If the intent, however, is to add some details about specific revelations to the sentence, which would, in fact, make it much stronger, you could write something like: "The newspaper contained the following revelations about global warming: scientists now say the major Antarctic ice sheets are melting at a much faster rate than previously believed and will raise sea levels XX inches by the year XXX." (You could easily look up some statistics.)