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Milestones and distances · Word problems · Earlier days

Average speed from milestones

A car travels at a uniform speed. The driver sees a milestone showing a two-digit number XYXY. One hour later the driver sees a milestone showing the same digits in reverse order, YXYX. One hour after that the driver sees a milestone showing a three-digit number X0YX0Y, with a 0 between the same two digits. What is the speed of the car, in km/h?

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