...Beauty, cleaning, DIY tips and more - free to join!
   Login   Contact us   Site map   Puzzle Club   Ask a question    Newsletter

Average speeds

a man drives from a to b at 30 km/hr which are 13 km apart. he then turns around and drives back from b to a. For the total journey (a to b, then b to a) the average speed was 60 km/hr. What speed did he drive back from b to a at?
Question asked by: montyspurs

Asked on: 29 Nov 2010

So you know that he drove at 30 on the 13 km out. So first thing to know is that the speed on the way back is a lot more. So presumably he drove at 90km/h on the way back so that 30 + 90 = 120 / 2 = 60 for the average?
By: knowitall
Replied at: 05 Dec 2010
Rate Answer
Comment or provide your answer to this question
No comments have been added to this question "Average speeds ".
Ask a New Question

Find out more about Maths

Maths Questions and Answers

algebra Questions and Answers

Next question: how many mappings we have for a set of order three


Become a Member! It's Free >>>

Share on Facebook: On Twitter: TwitterTweet this!

Question Keywords

speeds  average  

More Questions:

About Boat And Stream
What Is The Area Of The Square When A Diagonal Is Given ?
What Is The Easiest Way Of Working Out Percentages In Your Head?for Example, How Can You Work Out 25% Of 328? I Cant Work Out 0.25x328 Mentally?
A Salary Is Increased By 3% To 39552
31-(8+4)=