This is not really an accurate question. It's asking what is the speed (mph) of a distance (km). What the questioner may actually mean is what is the equivalent mph of 260kph. Well, unless I want to be very very accurate I always divide or multiply, depending on which way I want to convert, by 6 and adjust the decimal point accordingly. So, 100km = 60 miles. Or 200 miles = 330 km.
If I've made a correct assumption of what the question really means, then the answer is 260 x 6 = 156 mph
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162,5 mph
6 mph = 9.6561 km/h
400 km in what time is missing
429.7 km/h
km is a measurement of distance and mph is a measure of velocity. However 1 mph =1.609344 kph (km per hour) so 400 mph = 400 * 1.609344 = 643.7376 kph