A man in a boat rowing away from a lighthouse 100 m tall, takes 2 minutes tochange

the angle of elevation of the top of

A man in a boat rowing away from a lighthouse 100 m tall, takes 2 minutes tochange

the angle of elevation of the top of the lighthouse from 60o

to 45o

. Show that

 

the speed of the boat is 50 3- root3 /3

m / m in .​

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