All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Just Math
A to B (Posted on 2004-03-10) Difficulty: 2 of 5
You need to go from point A to point B, and then back to point A. Points A and B are 20 miles apart. You go to point B at a constant speed of 15 miles per hour. If you want your overall speed to be 30 miles per hour, how fast would you have to go from point B back to point A?

See The Solution Submitted by ethan    
Rating: 1.8182 (11 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
A little relativity | Comment 6 of 15 |
Unfortunately an infinite speed cannot be achieved as nothing can appear to go faster than light, therefore this problem has no solution in the real world. The only way is could be achieved is in the frame of me, the  traveller in which case I would need to become a massless particle and move exactly at the speed of light so the distance was Lorentz contracted to zero and I got there at the same time as I left (like photons do).
  Posted by Jils on 2004-03-10 16:14:35
Please log in:
Remember me:
Sign up! | Forgot password

Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Copyright © 2002 - 2018 by Animus Pactum Consulting. All rights reserved. Privacy Information