It is 50/1000, which can be simplified. However, simplification will result in a loss of information about the accuracy of the number.
1000 m = 1 km so 50 m = 50/1000 km = 0.05 km
200 m /1 km = 200 m/1000 m = 1/5
1/1000
There are 1000 m in 1 km, thus 50 m = 0.05 km.
1/1000
1/4
It is 0.85
850 m / 1 km = 850 m / 1000 m = 850/1000 = 17/20
Since 100 m is less than 1 km, the relevant fraction has an absolute value less than 1 and so there is no equivalent vulgar fraction.
The decimal fraction is 0.1
1000M (metres) = 1 KM therefore 1 metre is 1/1000th
Fifty 1 km = 1,000 m 0.5 km = 500 m 0.05 km = 50 m