Speed

Speed
Speed of road, rail, air etc. travel
In French, speed is measured in kilometres per hour :
100 kph = approximately 63 mph
100 mph = approximately 160 kph
50 mph = approximately 80 kph
X miles per hour
= X miles à l’heure
X kilometres per hour
= X kilomètres à l’heure or X kilomètres-heure
100 kph
= 100 km/h
what speed was the car going at?
= à quelle vitesse la voiture roulait-elle?
it was going at 150 kph
= elle roulait à 150 km/h (cent cinquante kilomètres-heure)
it was going at fifty (mph)
= elle roulait à quatre-vingts à l’heure (i.e. at 80 kph)
the speed of the car was 200 kph
= la vitesse de la voiture était de 200 km/h
(the de must not be omitted here)
what was the car doing?
= la voiture faisait du combien?
it was doing ninety (mph)
= elle faisait du 150 (du cent cinquante : i.e. 150 kph)
it was going at more than 200 kph
= elle roulait à plus de 200 km/h
it was going at less than 40 kph
= elle roulait à moins de 40 km/h
A was going at the same speed as B
= A roulait à la même vitesse que B
A was going faster than B
= A roulait plus vite que B
B was going slower than A
= B roulait moins vite que A or B roulait plus lentement que A
Speed of light and sound
sound travels at 330 metres per second
= le son se déplace à 330 m/s (trois cent trente mètres-seconde or mètres à la seconde)
the speed of light is 186,300 miles per second
= la vitesse de la lumière est de 300 000 km/s (trois cent mille kilomètres-seconde or kilomètres à la seconde) (note that the de must not be omitted here)

Big English-French dictionary. 2003.

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