"Hear & Identify What the Time is!"
Your grandma’s wall clock chimes the appropriate number of times at
every whole hour, and also once every 15 minutes. If you hear the wall
clock chime once, how much more time do you need to figure out what the
time is, without looking at it?
This is the way to figure out the exact time!
Source
This is the way to figure out the exact time!
Source