## 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

# The River

Spoiler for best guess

Go to the full post

5 replies to this topic

### #1 ThunderCloud

ThunderCloud

• Members
• 102 posts
• Gender:Male
• Location:New England

Posted 25 February 2013 - 01:37 AM

This one isn't too hard, but is a fun exercise.

Two motor boats began speeding toward one another at the same time from opposite shores of a river. Upon reaching the opposing shore, each motor boat immediately reversed course and headed back to his original shore. In so doing, the motor boats passed each other twice. The first time they crossed, they were 700 feet from one shore of the river; the second time, they were 300 feet from the opposite shore. Assuming each boat traveled with constant speed, and neglecting any influence of river current, how wide is the river?

Edited by ThunderCloud, 25 February 2013 - 01:39 AM.

• 0

Senior Member

• Members
• 1837 posts
• Gender:Female

Posted 25 February 2013 - 06:00 AM   Best Answer

Spoiler for best guess

• 0

### #3 Debasis

Debasis

Junior Member

• Members
• 35 posts

Posted 26 February 2013 - 12:12 PM

Spoiler for

Edited by Debasis, 26 February 2013 - 12:18 PM.

• 0

### #4 Debasis

Debasis

Junior Member

• Members
• 35 posts

Posted 26 February 2013 - 12:18 PM

Spoiler for best guess

why?

• 0

### #5 ThunderCloud

ThunderCloud

• Members
• 102 posts
• Gender:Male
• Location:New England

Posted 27 February 2013 - 11:17 PM

Spoiler for best guess

why?

Spoiler for Detailed Solution

• 1

### #6 Debasis

Debasis

Junior Member

• Members
• 35 posts

Posted 12 March 2013 - 10:51 AM

Spoiler for best guess

why?

Spoiler for Detailed Solution

Thanks!

• 0

#### 0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users