Speed is equal to the change in distance over the change in time, or V = D/T where V is speed, D is distance and T is time.
If you mean the drug "amphetamine" know as "speed" the formula is C9H13N (1-phenylpropan-2-amine)
Correction: [No, actually V doesn't stand for speed, V is velocity.]
Correction to the correction v with an arrow above it is velocity. small case v is speed but in this formula the capitol V is volume so that is wrong
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The formula to determine speed is Speed= wavelength*frequency
Actually, unlike common belief there is no exact formula. Scientists (that is the more advanced ones) estimate the speed and velocity of an object or person by looking at it and making a so called "Scientific Guess". It is pretty technical but i think you can understand this brief explanation.
speed=dt
The formula is [ Speed = a number ], or [ Slater = Searlier ], or [ |Acceleration| = 0 ].
speed = distance / time