A 5 horsepower (hp) engine can do work at a rate of approximately 3,730 watts (since 1 hp is equivalent to about 746 watts). To determine how fast work can be done, you can calculate the amount of work done over time. For example, in one hour, a 5 hp engine can perform about 13,560,000 joules of work (since 3,730 watts multiplied by 3,600 seconds equals 13,428,000 joules). Therefore, the speed at which work is done depends on both the power output and the time it operates.
Depends on gearing
There are many more factors involved than just hp. No way to answer that one with hp only.
about 33 mph
Because of its 645 hp engine
Horsepower (hp) is unit of measurement of power, the rate at which work is done.
Equal... in what sense? hp (horse-power) is a unit of power; 280 hp is more than 250 hp. An engine that works at a higher power can get more work done per time unit. Such an engine is also likely to use up more fuel - assuming the energy efficiency of both is similar.
50 miles per hour
25-40
Depending on if your engine has a restriction or a set speed, you can go as fast as 55 to 65 miles a hour.
If you mean HP=Horsepower, and CC= Cubic centimeters then HP does have anything to do with CC's. Cc's are the size of the displacement of the engine. HP is the amount of power the engine produces.
there is no real "fast" engine. Cars are fast, but engines are not. U would probably say that the most powerful car engine in the fastest car is bugatti's improved 1200 hp engine in its new bugatti supersport
It will go about 40 to 50 mph