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A submarine is 300. m horizontally out from the shore and 100m. beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 210 m from the shore. If the beam just strikes the top of a building standing directly at the waterâ€^TMs edge, find the height of the building. How long does it take for the laser bream to reach the building?

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