- Thread starter Laksh13
- Start date

- Joined
- Jan 27, 2012

- Messages
- 7,546

So the total trip, 2d miles, required d/x+ d/y= d(x+ y)/xy hours. The average speed for the entiire trip was "distance divided by time"= 2d/[d(x+y)/xy]= 2xy/(x+ y) miles per hour. We are told that is 50 miles per hour so have 2xy/(x+ y)= 50. xy/(x+ y)= 25. xy= 25(x+ y)= 25x+ 25y. xy- 25y= y(x- 25)= 25x. y= 25x/(x- 25). Mathematically x can be any number except 25 miles per hour. Practically, there are limits as to how fast he can go and, of course, x cannot be negative.

- Joined
- Jun 18, 2007

- Messages
- 24,691

Let provided asked you very important, yet simple question - you didn't answer that.

Prof Ivey gave you fairly detailed instructions - you do not follow those.

When are YOU going to do and show YOUR work!!!!

Can you send me the whole answer in document form if possible, I will try to understand from thatLet provided asked you very important, yet simple question - you didn't answer that.

Prof Ivey have you fairly detailed instructions - you do not follow those.

When are YOU going to do and show YOUR work!!!!

Last edited by a moderator:

- Joined
- Jun 18, 2007

- Messages
- 24,691

No - I will not provide complete answer prior to YOU showing YOUR work.Can you send me the whole answer in document form if possible, I will try to understand from that