1,242.7 miles per hour.
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There are 1.609344 kilometres in one mile. Therefore, 35 miles per hour is equal to 35 x 1.609344 = 56.32704 kilometres 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.
To convert miles to kilometers, multiply by 1.6. The same if you want to convert miles/hour to kilometers/hour.
To convert miles per hour to kilometres per hour, multiply by 1.609344. Therefore, 187 miles per hour is equal to 187 x 1.609344 = 300.947328 kilometres per hour.
To convert from miles per hour to kilometres per hour, multiply by 1.609344. Therefore, 71 miles per hour is equal to 71 x 1.609344 = 114.263424 kilometres per hour.