15 km = 9.321 miles
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There are 1.609344 kilometres in one mile. Thus to convert from miles to kilometres you have to multiply by 1.609344. In this case we do: 1,400 x 1.609344 = 2253.0816 Therefore, in 1,400 miles, there are 2,253 kilometres.
It depends on whether you convert 3.495 inches, metres, miles, kilometres, light years or other measures of distance.
15 miles is equal to 15 x 1.609344 = 24.14016 kilometres. Dividing 400 kilometres by 24.14016 kilometres per hour. and rounded to two decimal places, gives 400/24.14016 = 16.57 hours or approximately 16 hours 34 minutes.
100 miles per hour = 100*1.609344 kilometres per hour = 160.9344 kilometres per hour = 160.9344/3600 kilometres per second = 0.0447 km per sec (approx).
To convert miles per hour to kilometres per hour, multiply by 1.609344. In this instance, 25 x 1.609344 = 40.2336. Therefore, 25 miles per hour is equal to 40.2336 kilometres per hour.