1 mile per hour = 1.60934 kilometres per hour.

1 mile per hour is equal to 1.609344 kilometres per hour. Therefore, 75 miles per hour is equal to 1.609344 x 75 = 120.7008 kilometres per hour.

1 meter per second = 3.6 kilometers per hour

1 knot is defined as exactly 1.852 kilometres per hour. Therefore, 23 knots is equal to 23 x 1.852 = 42.596 kilometres per hour.

Converted to miles per hour, and rounded to two decimal places, 42.596 kilometres per hour is equal to 26.47 mlies per hour.

211 mph = 339.6 (to 1 dp) kilometres per hour