Answer :



ACB = 60⁰ and ADB = 30⁰


Let, the length of CD = x m


And the length of CB = y m

      
     y = 57.73 m

 

     

⇒  x + y = 173 m

x = 115.27 m

Speed of the boat = Distance/Time

= 57.635 m/min


OR



AEB = 60⁰ and DEC = 30⁰


Let, length of BE = x m


And length of two equal poles = h m


Then, length of EC = 80 – x m

    

         …(1)

      

   …(2)


From eq (1) and eq (2)

80 – x = 3x

x = 20 m

h= 20√3 m

So, the length of BE = 20 m

length of EC = 80 – 20 m = 60 m

length of two equal poles = 20√3 m

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