Swarms may move up to 20 kilometres in a day.

The city covers an area equal to 205.07 square kilometres.

Its beam can be seen up to 50 kilometres away.

Its top speed is a matter of debate, but estimates go up to 90 kilometres per hour.

His lead with 10 km to go had fallen to two kilometres.

Usually this process took place every 500 to 1,000 kilometres.

The format remained the same for 2010, except the Saturday race was increased to 120 kilometres.

In the book, a league is equivalent to four kilometres.

The bumper on your car can absorb any impact up to 20 kilometres per hour.

It takes just eight minutes for a rocket to accelerate to 27,000 kilometres per hour.