Mathematics, 06.11.2019 07:31, vinp190p9zekn

It takes mr. been 90 seconds to walk up an escalator when it is not moving. it takes mr. been 60 seconds to go up, just standing when the same escalator is moving. how many seconds does it take mr. been to walk up the moving escalator?

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It takes mr. been 90 seconds to walk up an escalator when it is not moving. it takes mr. been 60 sec...