The skier can pass distance in 20 km for 2 h, the cyclist can pass the same distance on the highway for 1 h, the car – in 20 min. What speed of the skier, cyclist and car?

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The skier - 20 km. 2 hours its speed are 10 km/h. (20:2) The cyclist - 20 km. 1 hour. Its speed is 20 km/h the Car - 20 km. 20 min. 20/60 = 1/3 km/h I do not know for sure its speed, but it seems so. And the more so on a condition it is not told in what it is necessary to determine speed (in hours, minutes) therefore I made in hours. As usually speed in hours.
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