A kilometre is a unit of distance. An hour is a unit of time. Without some unit of speed to convert, the two units are incompatible.
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This problem does not have an answer. This is because a kilometer is a unit of distance and an hour is a unit of time. You might mean "How many hours does it take to walk 5 km?" , however that is just a guess of what you may mean, but from your question I can only say that it does not have an answer/solution.
a hectare is a unit of area, a kilometer is a unit of distance. The two do not convert into each other.
Answer: 190 km/h = 118.1 mph
Two.
17,531.6255 hours