speed
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Velocity is defined as speed in a certain direction, or vector.
This is because speed is defined as the absolute value of velocity - irrespective of the direction of motion.
If the direction of motion is constant then the velocity is the same as the speed in that direction. If the direction is not constant, the information given is nowhere near sufficient to calculate the velocity.
Velocity measures speed in a given direction.
The 'speed' of a body cannot be negative. But if you are stating the 'velocity' then it can be negative. Negative velocity means it is going opposite to the direction that you decided to call the positive direction.