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Leon walked up and escalator while it was moving, at the rate of one step per second and reached the top in 30 steps.

Leon walked up and escalator while it was moving, at the rate of one step per second and reached the top in 30 steps. The next day he climbed two steps per second (skipping none), also while it was moving, and reached the top in 48 steps. If the escalator had been stopped, how many steps did the escalator have from the bottom to the top?

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