A man in a boat rowing away from a lighthouse 100m high takes 2 minutes to change angle of elevation of the top of a lighthouse from 60 degree to 45 degree find the speed of boat in kilometer per hour ??
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AB is a lighthouse of height 100m. Let the speed of boat be x metres per minute. And CD is the distance which man travelled to change the angle of elevation. Hence, the speed of the boat is 57.80 metres per minute.
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