## 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

# Averages part I

Best Answer gavinksong, 29 July 2013 - 04:58 PM

Spoiler for solutions

Go to the full post

Senior Member

• Members
• 1837 posts
• Gender:Female

Posted 29 July 2013 - 04:18 PM

Examine the following two problems:

A fellow travels from city A to city B. For the first hour, he drove at the constant speed of 20 miles per hour. Then he (instantaneously) increased his speed and, for the next hour, kept it at 30 miles per hour. Find the average speed of the motion.

A fellow travels from city A to city B. The first half of the way, he drove at the constant speed of 20 miles per hour. Then he (instantaneously) increased his speed and traveled the remaining distance at 30 miles per hour. Find the average speed of the motion.

These two problems are often confused.  Calculate the solutions of the two problems.  What is the difference in value between the two questions?

• 0

### #2 gavinksong

gavinksong

• Members
• 403 posts
• Gender:Male
• Location:i'm a bird

Posted 29 July 2013 - 04:58 PM   Best Answer

Spoiler for solutions

Edited by gavinksong, 29 July 2013 - 04:58 PM.

• 0

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

0 members, 0 guests, 0 anonymous users