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OpenStudy (anonymous):
Two trains are 150 km apart. Train A moves at 50.0 km/hr towards train B, which moves at 30.0 km/hr toward train A on the same track. How much time (in hours) do they have before the trains collide?
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OpenStudy (anonymous):
Use the relative velocity to calculate the time Train B moves towards Train A with a relative velocity (50+30)80.0 km/hr and distance between them is 150 km,so divide 150/80 = 1.875 hr or 1 hr 52 min 30 sec
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