As observed from the top of a 100 m high light house from the sea level the angles if depression of two ships 30 degree and 45 degree . If one ship is behind the other on the same side of the light house find the distance between the two ships

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How many bricks of length 25 cm breadth 15 CM and height 10 cm are required to make a hall of length 6 metre height 2.5 metre and breadth 0.5 metre
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