1. The problem statement, all variables and given/known data A shopper in a department store can walk up a stationary escalator in 30 s. The normally functioning "up" escalator can carry the standing shopper to the next floor in 42 s. Assume the same walking effort for the shopper whether the escalator is stalled or moving. How long will it take the shopper to walk up the moving escalator? How long will it take the shopper to walk down this upward moving escalator? If she escalator is stalled, the shopper will make the trip up and down the escalator: Faster Slower In the same time None of these 2. Relevant equations I did not use any to solve the first part. I am unsure about the second part though. 3. The attempt at a solution For the first question: 1 / 30 + 1 / 42 = 2 / 35 35 / 2 = 17.5 seconds I don't even really know where to start on the second part. I already wasted two attempts on this third part so the answer is either quicker or slower. This problem should be fairly easy to understand but for some reason I cannot wrap my head around the second and third parts. Any help is appreciated, thanks.