Journey
The road from A to B measures 11.5 km. Firstly up the hill, then by level plane and then downhill. Tourist goes uphill at 3 km/h, on the plane 4 km/h and downhill 5 km/h. From the point, A to B went 2h 54 min back 3h 6 min. How long is the segment of the level plane?
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