A person standing on the edge of a well throws a stone vertically upwards with an initial velocity \[5\,\,m{{s}^{-1}}.\]The stone gone up, comes down and falls in the well making a sound. If the person hears the sound 3 second after throwing, then the depth of water (neglect time travel for the sound and take \[g=10m{{s}^{-2}}\])

• A.  1.25 m                 
• B.  21.25 m  
• C.  30 m    
• D.  32.5 m