Concept of power

If you put a competition between two persons to eat certain food with in very little time, then the person who eats the total food completely before another person with in very short time, he will win, i.e., he has more power than other. What means here? time is the factor with in which he has completed his work.
If you take any two engines, then the task completed by the one engine than other engine will have certainly more power.
So, we can define power is rate of doing work by a force.
Generally, we take power in terms of horse power to express output of machine in engineering subject.
Power is scalar even force and velocity are vectors