make km an hour vs do km an hour

Some examples from the web:

• "At 250 km an hour,"it runs like it flies
• Then 170-mile-an-hour bikes before the move to MotoGP and over 200 miles an hour.
• It makes no sense to spend EUR 6 billion on the Messina bridge to shorten journeys by half an hour when thousands of Sicilians are without drinking water and it takes three hours to complete a 100-km journey by train.
• Traveling approximately 50 kilometers an hour.
• About an hour before my daughter got home.
• Bears game starts in an hour.
• Justice Lamb called an hour ago.
• - About an hour outside town.
• Bogdan made contact half an hour ago.
• The President accepted my resignation an hour ago.
• Maybe an hour before the preservation spell wears off.
• They stopped here for an hour.
• Train moving 100 miles an hour.
• Just confirmed one an hour ago.
• I got here an hour ago.
• Aceway Airlines released a statement an hour ago.
• Band started about an hour ago.
• I was due home an hour ago.
• HE LAUGHS 300 kilometres an hour.
• Winner gets me for an hour.

Some examples from the web:

• "At 250 km an hour,"it runs like it flies
• The new EU regulations require two million vehicles to drive at less than either 90 km per hour or 100 km per hour, depending on their size.
• Finally the very high speed limit (130 km per hour) makes it difficult for vehicles to stop and dramatically increases fuel consumption.
• - Are at least 65 km per hour.
• YR: It's about 300 km per hour before looping.
• It also notes that the average speed of international freight transport by rail has declined to 18 km per hour.
• Four cylinders in V, 80 HP, 6000 RPM maximum speed of 160 km per hour.
• Whilst being fully armed, they must finish running 60 km in 8 hours.
• Running 60 km within 10 hours.
• The figure of 21 km can be obtained by dividing the total number of kilometres by the number of driving hours: 1157568 km: 54290 hours = 21,32 km per hour.
• -Did you fall at 30 km per hour?
• Kagoshima and Hakata at top speeds oft 260 km per hour, drawing wide regional interest
• And that is how the moving monument came to be. Powerful pumps were installed, and today a very strong jet of water spouts 500 liters per second vertically at 200 km per hour.
• The era of containers being transported from the North Sea port to Northern Italy on trains crawling along at 18 km per hour must be consigned to history as soon as possible.
• Derryquay National School is located on this road, where a 100 km-per-hour speed limit exists, even directly in front of the school.
• The antenna drive system and the antenna shall be such as to allow correct operation at wind speeds of up to 100 km per hour.
• According to Austria, at 21 km per hour Verkehrsverbund Tirol assumed a relatively high number of driven kilometres per hour, as the average for Austria is 16-18 km per hour.
• "doing approximately 140 km per hour, I engaged in overtaking a vehicle."
• He says, "Marie is like those trains in Japan." "That glide through the countryside." "At 800 km per hour.
• So, if you're cruising along the left side of the road at a 120 km per hour in zis kheavy desert, turn up the decibels