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October 21, 2014

October 21, 2014

Posted by **joy** on Saturday, July 31, 2010 at 4:51am.

- math -
**Reiny**, Saturday, July 31, 2010 at 6:58amspeed of plane in still air --- x km/h

speed of wind ---- y km/h

speed of plane with the wind --- x+y km/h

speed of plane against the wind -- x-y km/h

first fact:

5(x+y ) = 3000

x+y = 600 #1 equation

second fact:

10(x-y) = 3000

x-y = 300 #2 equation

add #1 + #2, it becomes so easy.

- math -
**joy**, Saturday, July 31, 2010 at 11:21amspeed of a plane in still air is 450

speed of wind is 150

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