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某人沿着向上移动的自动扶梯从顶朝下走到底用了7分30桫,而他沿着自动扶梯从底朝上走到顶只用了1分30秒。如果这个人不走动,乘着扶梯从底到顶需要用
It took 7 minutes and 30 minutes for someone to walk from the top down along the escalator moving up, and it took him only 1 minute and 30 seconds to climb up the escalator from the bottom up. If this person does not move, use the escalator from bottom to top to use