A plate moving at a rate of 3 cm/year is moving toward a plate that is 1,500 km away. In how many years will the plates collide?

Convert the distance to centimeters: 1,500 km = 150,000,000 cm. At 3 cm per year, the time is 150,000,000 ÷ 3 = 50,000,000 years, so the plates will collide in 50,000,000 years.

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