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?

Result

x =  3.7 m

Solution:

x=3.52+1.22=3710=3.7 mx=\sqrt{ 3.5^{ 2 }+1.2^{ 2 } }=\dfrac{ 37 }{ 10 }=3.7 \ \text{m}



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