Yes, all wavelengths of light have the same velocity in every medium. In fact, all types of electromagentic radiation travel at the same speed in a given medium.
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Feet refers to a distance while seconds is time, so you can't say that there are a certain number of feet in one second. You can however say that you travel a certain number of feet in one second, but that number depends on the velocity that you are traveling at.
Velocity is equal to distance traveled divided by the time it took to travel. v = d / t Velocity also equals the initial velocity plus the acceleration times time. v = v1 + a(t)
Another car would have to travel at 70 km/hr west.To have the same velocity, it must have the same speed toward the same direction.
If, and only if the trip was in a straight line, the velocity is 45.6 miles per hour approx.