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

VOA: special.2010.05.11

"We start off by asking them to complete a national three-hour long educational program.

VOA: special.2011.07.29

He would circle the Earth three times during a five-hour Mercury flight.

VOA: special.2009.06.17

"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

"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