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Milestones and distances

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1. Average speed from milestones ●●○○○ 20 ptsA car travels at a uniform speed. The driver sees a milestone showing a two-digit number $XY$. One hour later the driver sees a milestone showing the same digits in reverse order, $YX$. One hour after that the driver sees a milestone showing a three-digit number $X0Y$, with a 0 between the same two digits. What is the speed of the car, in km/h?

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