Interval and Pickup Problems: Problem 1

Problem: At the subway station, there is an escalator that moves with a constant speed. If Nadia moves up one step per second, she needs to take twenty steps down to get on the lower level again. If she moves up two steps per second, she needs to take 30 steps down to get on the lower level again. From the top of the escalator to the bottom, how many steps are there?

Key: Write functions

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