A lighthouse, facing north, sends out a fan-shaped beam of light extending fron north-east to north-west. An observer on a steamer, sailing due west, first sees the light when he is 5 km awayfrom the lighthouse, and continues to see it for 30 x sqrt.2 minutes. What is the speed of the steamer...? Can anyone draw a figure for this ?
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UP 0 DOWN 0 0 0
