v = s/t (where v and s are vectors)
Where (using SI units):
v is the velocity of the body in metres per second (ms^-1)
s is the displacement of the body in metres (m)
t is the time taken to travel from the initial point to the final point in seconds (s)
2. (One dimension) If you travel west for a ten seconds at 1ms^-1, take a break for twenty seconds and then travel for another ten seconds at 1ms^-1, your velocity for the trip will be .05ms^-1 due west.
3. (Two dimension) If you start at point A and travel north at 3kmh^-1 for two hours, and then instantaneously change direction and travel due east for four hours at a speed of 2kmh^-1 to point B, your velocity for the trip is 10kmh^-1 N53°E (53°T)