Two people fishing from rowboats on a lake are 100 m apart and have hooked their lines int...

Two people fishing from rowboats on a lake are 100 m apart and have hooked their lines into the same sunken log. The first has 85 m of line out, and the second has 68 m of line out. Assuming that the lines both lie in the same vertical plane, meet at a point (on the log), and are taut, how deep is the sunken log?

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