Student or Learner
"The clock tells the time". I saw this sentence in a book ,but I think it is "shows" is the correct.
"Look at the clock. Can you tell the time?"
"Is your daughter old enough to tell the time yet?"
A clock does, of course, show (or display) the time. However, it is possible to use "tell the time" instead.
"I think my clock needs a new battery."
"Why? Doesn't it tell the time correctly any more?"
"No. It's very slow."