Monkey spring distance

Two monkeys were sitting on a tree, one at the top and the other 10 cubits from the ground. Both wanted to drink from a spring that was 40 cubits away. One monkey jumped to the spring from the top and flew the same path as the other monkey.
How long did they fly?

Final Answer:

x =  41.2311

Step-by-step explanation:

$$\begin{gathered} a=10 \\ b=a=10 \\ c=40 \\ x=\sqrt{a^2+c^2}=\sqrt{10^2+40^2}=10\sqrt{17}=41.2311 \end{gathered}$$

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