# As observed from

Let AB be the light house, B be the top of light house,

And C and C' be the positions of ship as angle of depression changes from 30° to 60°

We can draw a mathematical diagram for the above problem.

We know that,

In ∆ABC

AC = 173 m

In ∆ABC'

AC' = 57.8 m (appx)

Distance travelled by ship

AC - AC' = 173 - 57.8 = 115.2 m

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