Well if you live fast you die young, that's pretty important.
I assume you meant the speed of light.
For every material, there is a constant that determines the angle that light will refract through when it passes from air (or a vacuum) into that material. That constant is c and is usually written like this:
aircwater, this would be the constant for light passing from air into water, I think that the constant is called the refractive index, and in the case of water it would take the value 1.33 (maybe). This means that the speed of light in water is the speed of light in air divided by 1.33.
c also equals sin i / sin r where i is the angle of incidence and r is the angle of refraction.
Unfortunaktely this is as far as I can take you for light, I can't think of any experiment to actually measure the speed of light. However I can tell you that it is approximately 2.997 * 10^8 m/s.
For sound though, that is much simpler. For this you will need a stopwatch, a pair of symbols and a friend willing to walk as far down the street as possible.
Your friend clashes the symbols together as hard as he can and when you see him do this, start the stopwatch. When you hear the sound stop the stopwatch. As bigger distance as possible is needed for this to make it more accurate, but you will also need to measure the distance between the two of you.
Alternatively, if you had access to some microphones and some equipment, you could set it up so that when mic 1 detects a sound it starts a timer, then when mic 2 detects a sound it stops a timer. Place them a measured distance apart and have them both facing the same way. Stand directly in line with the two of them but closest to mic 1, then clap two wooden blocks together. This will give the effect of measuring the time taken for sound to travel from mic 1 to mic 2, then speed = distance/time.
I hope this has helped you out for the sound, sorry about not being able to help you out so much for the light.
