The subway escalator moves evenly downward at a speed of 1.6 m / s. The passenger, on the other hand, relative to the escalator descends evenly downward at a speed of 2 m / s. What is the passenger’s speed relative to the Earth?
1. According to the condition of this problem, the metro escalator moves uniformly downward at a speed of 1.6 m / s, which means its speed relative to the Earth is 1.6 m / s.
2. The passenger moves evenly down this escalator at a speed of 2 m / s relative to the escalator itself.
3. So, proceeding from points 1 and 2 and taking into account that the passenger and the escalator move in the same direction, the passenger’s speed relative to the Earth is 1.6 + 2 = 3.6 m / s = 3.6 * 1/1000: 1/3600 = 12.96 km / h …
4. Answer: D) 12.96 km / h.
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