1. Two ships are sailing in the sea on the two sides of a lighthouse. The angle of elevation of the top of the lighthouse is observed from the ships at 30° and 45° respectively. If the lighthouse is 100 m high, the distance between the two ships is:
2. A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
3. A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
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