In the 2024 Yemen coast Hellfire missile video, how fast is the missile travelling?

I know the max speed is up to 995mph, but is it flying at a slower speed in this video? Also, is it equipped with an explosive head that didn't explode? Also, anyone got a guess of how far away the MQ9 drone is thats filming it? I guess if we knew the speed of the missile it would be easier to make an estimate?