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March 5, 2015

March 5, 2015

Posted by **Libuse** on Sunday, February 26, 2012 at 8:41pm.

- algebra -
**Reiny**, Sunday, February 26, 2012 at 8:53pmspeed of plane in no wind --- x mph

speed of wind ---- y mph

time with the wind = 720/(x+y) = 3

3x + 3y = 720

x + y = 240

time against the wind = 720/(x-y) = 4

4x - 4y = 720

x-y = 180

add the two simplified equations:

2x = 420

x = 210

back in x+y=240

210 + y = 240

y = 30

the plane has a speed of 210 mph, and the wind was 30 mph

- algebra -
**Libuse**, Sunday, February 26, 2012 at 8:57pmYou are smart! Thanks!

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