IDK... you should probably travel 200 km by horse yourself and then see how long it takes you
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If you meant 25 km/hour then the horse will travel 12.5 km in 30 min.(1/2 hour) .
Travelling at 100 m per second? per minute, per hour, day, year?
28 minutes 34.29 seconds.
1 km = 1000 metres so 0.2 km = 200 metres. Simple!
10 dm = 1 m so 200 dm = 20m. 20 km is 1000 times as long. This is assuming "dm" = decimetres. If it = dekametres then 200 would be 2 km.