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Physics. Problem solving. 01_07

Physics. Problem solving. 01_07У вашего броузера проблема в совместимости с HTML5

Addition of velocities (1-dimension).

A subway escalator lowers a person walking down it in 1 minute. If the person walks twice as fast, he will descend in 45 seconds. How long does the person standing on the escalator go down?

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