Javascript Disabled Detected

You currently have javascript disabled. Several functions may not work. Please re-enable javascript to access full functionality.

Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)

Guest Message by DevFuse

Two boats

Started by bonanova, May 08 2012 09:30 AM

Please log in to reply

3 replies to this topic

#1 bonanova

bonanova

Moderator
4784 posts

Gender:Male
Location:New York

Posted 08 May 2012 - 09:30 AM

A Sam Lloyd classic puzzle has two ferry boats starting at the same instant from opposite sides of a river, traveling across the water at right angles to the shores. They travel at constant, but possibly different speeds. The boats pass at a point 720 yards from the nearest shore. Both boats dock for 15 minutes, to discharge and receive passengers, before heading back. On their return trips they meet again, 400 yards from the other shore.

How wide is the river?