"Of speed" or "speed"?

... can reach (a speed of) 150 mph in ten seconds.

Your idea is not good for me, because if i change my sentence into yours, it would make no sense.

The idea for my sentence is that the car can drive one kilometer in 10 seconds at 150 mph (speed or of speed). That sentence is just an example, my numbers are different. Or also i can write it as one kilometer can be driven in 10 seconds at 150 mph (speed or of speed).

Not sure whic

AnonymousYour idea is not good for me, because if i change my sentence into yours, it would make no sense.

That's what can happen when you don't give a full sentence.

Anonymouscar can drive one kilometer in 10 seconds at 150 mph

If it goes one kilometer in ten seconds, it's going at 360 mph, not 150 mph.

That sentence was just an example, i've told you that my numbers will be different.

I think at the end i should use "speed", but i'm not sure, so i'm waiting for the confirmation from someone who really knows which one to use.

While you are waiting, perhaps you could capitalise all the I pronouns in your posts.