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Paheli moves on a straight road from point \(A\) to point \(C\). She takes \(20\ minutes\) to cover a certain distance \(AB\) and \(30\ minutes\) to cover the rest of distance \(BC\). She then turns back and takes \(30\ minutes\) to cover the distance \(CB\) and \(20\ minutes\) to cover the rest of the distance to her starting point. She makes \(5\) rounds on the road the same way. Paheli concludes that her motion is
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