Mathematics, 23.07.2019 01:10 ashliemallen
Agirl wants to count the steps of a moving escalator which is going up. if she is going up on it, she counts 60 steps. if she is walking down, taking the same time per step, then she counts 90 steps. how many steps would she have to take in either direction, if the escalator were standing still?
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Agirl wants to count the steps of a moving escalator which is going up. if she is going up on it, sh...
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