The most severe tornadoes can reach wind speeds of three hundred twenty kilometers an hour or more.

VOA: special.2010.05.11

This is because orbital debris travels at speeds of thirty-two thousand kilometers an hour or more.

VOA: special.2009.04.01

With specially cooled tracks and racing equipment, it is not unusual for luge athletes to reach speeds of one hundred forty kilometers an hour or more.

VOA: special.2010.02.10

Let sanitized cans air-dry for at least one hour before opening or storing them.

VOA: special.2010.07.19

Inside the car, they should open a window a little for fresh air and turn on the engine for ten or fifteen minutes every hour for heat.

VOA: special.2010.01.05

So,even in a persons darkest hour, he or she can feel less alone.

VOA: special.2010.02.24

One hour marks one twenty-fourth of a turn, or fifteen degrees.

VOA: special.2010.07.14

For safety reasons, both the park and the road from it south to Las Cruces, New Mexico may be closed for an hour or two while tests are taking place.

VOA: special.2010.01.04

This continued for half an hour or so.

VOA: special.2009.11.08

"And that short,few-hour exposure is able to trigger a heart attack where they might not have had it for days or months,or never."

VOA: standard.2010.08.04

"We have about three or four of us that lace up our tennis shoes at our lunch hour, and we walk for 30 minutes every day."

VOA: standard.2010.07.16

The American Heart Association recommends reducing time spent in heavy traffic or jogging during rush hour, or near busy roadways and better treatment for cardiovascular risk factors.

VOA: standard.2010.08.04

"Now we have what we would call rush hour conditions or peak travel conditions for as much as eight hours during the day - about three to four hours in the morning and similar time in the evening."

VOA: standard.2010.07.26

"They are all hurtling around in space at 36,000 kilometers per hour and so even a 1mm piece of space junk can destroy or damage a satellite because it all comes from either dead satellites, satellites which have broken up, satellites which had fuel left in them and exploded."

VOA: standard.2010.07.24