One Knot = 1.852 Kilometers per hour.
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There are 1.609344 kilometres in one mile. therefore, 40 miles is equal to 40 x 1.609344 = 64.37376 kilometres per hour.
100 MPH = 160 km/h
1 meter per second = 3.6 kilometers per hour
First, convert kilometres per hour to metres per hour. There are 1000 metres in one kilometre, therefore, 3.6 kilometres per hour is equal to 3.6 x 1000 = 3600 metres per hour. Next, convert metres per hour to metres per second. There are 3600 seconds in one hour. Therefore, 3600 metres per hour is equal to 3600/3600 = 1 metre per second.
50 metres = 1 second 3,000 metres = 1 minute = 3 kilometres 180 kilometres = 1 hour assuming 'in seconds' means one second