Homework Help: math

Posted by Laci on Thursday, October 4, 2007 at 10:07am.

I am having trouble with this motion problem.A jet travels 1,890 miles in 3 hours. flying against the same wind,the plane makes a return trip in 3 1/2 hours.Find the wind speed and the plane`s airspeed.My book gives the answer,but I just can not understand the concept of how they get the problem.Thanks for any help I can get.

math - bobpursley, Thursday, October 4, 2007 at 10:44am
(V+W)3=1890
(V-W)3.5=1890
divide the top equation by 3, and the second equation by 3.5

V+W=630
V-W=540

add the equations

2V=1170
solve for V, W

Take if from here.

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