answer: #Person1# thinks it's 10:30, but #Person2# says the clock is 20 minutes fast.
documents: #Person1#: Oh, it's already 10:30 now. I haven't finished my homework yet.
  #Person2#: Don't worry. The clock on the wall is 20 minutes fast.
  #Person1#: Great. Please tell Alice to wait for me till 11 o'clock.
  #Person2#: Where are you going?
  #Person1#: We're going to Sally's birthday party.
  #Person2#: When will it be?
  #Person1#: It will be at about 12 o'clock in the rose restaurant.