I think the wording of the question is a little confusing.
What do they mean by 'delay' here?
It seems like they are saying that it takes 96 microseconds for the sound to pass through the head at the given speed.
I wouldn't call that a 'delay' exactly, more an 'interval'.
If this is what they mean then you just multiply the 2 values given as I said.
The other meaning of 'delay' would require a different calculation where you would need to be given the speed of the sound waves in air and compare the time taken for the sound to travel through the head with the time taken to travel through thin air.
In this case the sound through the head would arrive earlier that the thin air sound as it travels faster through a solid - in this case the head.
So in effect there would not be a 'delay'. At least not the sound wave we are talking about.
With just the information given in this question, the 1st interpretation seems logical.
So my original reply is still the best bet.