Interview Question: Little Rock in a Boat

Sample Question #285 (brainteaser)
 
There’s a boat floating in a lake, and in the boat is a tiny rock that weighs a ton. If you somehow throw the rock into the lake, what happens to the water level?
 
[This used to be a very popular question]
Advertisements
This entry was posted in Sample Qs. Bookmark the permalink.

One Response to Interview Question: Little Rock in a Boat

  1. Brett says:

    ANSWER
     
    If the rock is tiny but very heavy, when it sits in the boat it displaces a lot of water (since it’s "using" the boat’s volume). After it’s thrown overboard, it only has its own volume which is very small, so it doesn’t displace any water, so the water level falls.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s