They were designed to fly at speeds up to six thousand four hundred kilometers an hour.

VOA: special.2010.07.07

He discovered that galaxies are moving away from Earth at speeds between three hundred kilometers a second and one thousand eight hundred kilometers a second.

VOA: special.2009.04.29

There was a new system of liquid nitrogen to keep the pilot cool and to resist the crushing force of gravity at high speeds.

VOA: special.2010.07.07

The F.C.C.wants one hundred million homes to have inexpensive Internet service at ten times current speeds.

VOA: special.2010.03.19

Dr.Craig Smith,the chief executive of Electro Optic Systems, says laser beams fired from the ground could protect astronauts and satellites by targeting space junk that travels at potentially devastating speeds.

VOA: standard.2010.07.24