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x= 2m y=?
p= 3 f=?
r=?
p= y/x 1/f= 1/x + 1/y
y= p * x 1/f= 1/2 + 1/6
y= 3 * 2 1/f= 3/6 + 1/6
y= 6m 1/f= 4/6
f= 1,5
r= 2 * 1,5
r=3