It's impossible! The 2 are different units, they can't be converted.
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18 Km= 11.1846 Miles OR 18 Km= 11 Miles and 325.0 Yards
1 kilometre = 1000 metres so 18 km = 18*1000 m = 18,000 m. Simple!
20m/4s = 5m/s = 300m/min = 18000m/h = 18km/h
U can convert km/h into m/s by multiplying it by 5/18. Here 18km/h = 5m/s
1 hour =3600 seconds=360 x 50/ 1000 =18km/hour