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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 36 seconds. How many seconds does it take him to run up the out-of-service escalator?

 May 19, 2021
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Boris takes 14 seconds to run up the out-of-service escalator.

 May 19, 2021

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