Mathematics, 31.07.2020 01:01 gymnast8900

Boris is playing on the mall escalators. One escalator goes up, one goes down, and one is out of service; otherwise, they're all identical. The up and down escalators go at the same speed. You can assume that Boris always runs at the same speed. Boris can run up the up escalator in 6 seconds. He can run up the down escalator in 30 seconds. How long does it take him to run up the out-of-service escalator? idk what to do

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Boris is playing on the mall escalators. One escalator goes up, one goes down, and one is out of ser...