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Physics. Problem solving. 01_06

Physics. Problem solving. 01_06У вашего броузера проблема в совместимости с HTML5

Addition of velocities (1-dimension).

A subway escalator lifts a passenger standing motionless on it for 1 min. The passenger climbs a stationary escalator in 3 min. How long will it take for the ascending passenger to walk up a moving escalator?

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