madrussian18

07-14-2011, 02:01 AM

Hi there! My name is Olga, and this is my first time using a resource like this, so here goes:

The question I have to solve is as follows:

"Flying to Kampala with a tailwind a plane averaged 158 km/h. On the return trip the plane only

averaged 112 km/h while flying back into the same wind. Find the speed of the wind and the speed of

the plane in still air."

I have figured out the following, but don't know where to go next since I don't have a time or distance to work with:

D= RT

P (plane speed)

W (wind speed)

P + W = 158 mph

P - W = 112 mph

I tried using 1hr as the time, but then all I get is 158 = 112, which makes no sense. I also tried combining the speeds and making an equation such as 170 = (p+w) (p-w), but I don't think that's right, and I don't remember how to factor either...it's been a long time since I've done algebra...preping for the GMAT now and I need all the help I can get...

thanks guy/gal volunteers working on this site!!

~O

The question I have to solve is as follows:

"Flying to Kampala with a tailwind a plane averaged 158 km/h. On the return trip the plane only

averaged 112 km/h while flying back into the same wind. Find the speed of the wind and the speed of

the plane in still air."

I have figured out the following, but don't know where to go next since I don't have a time or distance to work with:

D= RT

P (plane speed)

W (wind speed)

P + W = 158 mph

P - W = 112 mph

I tried using 1hr as the time, but then all I get is 158 = 112, which makes no sense. I also tried combining the speeds and making an equation such as 170 = (p+w) (p-w), but I don't think that's right, and I don't remember how to factor either...it's been a long time since I've done algebra...preping for the GMAT now and I need all the help I can get...

thanks guy/gal volunteers working on this site!!

~O