Who was the fastest Dinosaurier?

http://content.scholastic.com/b rowse/article.jsp?id=4755 copy

The fastest dinosaurs were probably the ostrich mimic ornithomimids, toothless meat-eaters with long limbs like ostriches. They ran at least 25 miles per hour from our estimates based on footprints in mud.

This site has lots of facts on dinosaurs...

http://content.scholastic.com/b rowse/article.jsp?id=4755 copy

The velociraptor was my first thought, but then there where "flying dinosaurs", like Archaeopteryx and Pterosauria, but I am not sure they are counted as true dinosaurs.

Quite obviously the Doyouthinktheysaurus

The fastest dinosaurs probably weren't any faster than modern-day land animals. Dinosaur speeds are deduced from fossilized trackway finds, and from looking at the dinosaurs' morphology (shape and structure). The speediest dinosaurs were bird-like bipedal carnivores (theropods) with long, slim hind-limbs and light bodies (hollow bones and a streamlined body): Dromiceiomimus,(means "emu mimic"), an ornithomimid, had long legs, small head, toothless beak, weighed about 220 pounds (100 kg), and was 11.5 feet (3.5 m) long).
Gallimimus and Ornithomimus (means "bird mimic") -were ostrich-like oviraptors with toothless beaks, long legs, and hollow bones. They could probably run as fast as an ostrich, , which can run up to 43 mph (70 kph).
Coelophysis (means "hollow form") - from the late Triassic period, had very sharp, serrated teeth and hunted in packs.
Velociraptor (means "speedy thief") - from the Cretaceous period, had very sharp teeth, and had retractable claws on its feet.
http://www.enchantedlearning.co m/subjects/dinosaurs/allabout/E xtremes.html copy