Finding force required to pull a block up an incline

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Attached is a question from my book, I know that the answer is 112KN but can't work out the method for getting there. Hope you can help, James
 

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You need to have some sort of information on the areas.
 
Which is funny because he has lengths which aside from buckling don't seem to serve any purpose.
 
You didn't give the areas, but by my calculations, it looks like the ratio of the areas of the two cylinders is 7/16. Is that right?

Let's see what you've tried so far and maybe we can spot your error.
 

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