Dig water well

Mr. Zeman digging a well. Its diameter is 120 cm, and plans to 3.5 meters deep. How long (at least) must be a ladder, after which Mr. Zeman would have eventually come out?

Correct result:

x =  3.7 m

Solution:

$x=\sqrt{3.5^2+1.2^2}={\displaystyle \frac{37}{10}}\text{ m}=3.7\text{ m}$

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