By velocity, you are referring to the speed of sound. It can be modelled by the equation:
V = 331m/s + (0.6m/s/C) x T (where T stands for temperature and V stands for Velocity).
Plug in the numbers and you'll get 343m/s
Dry and hot, receives less than ten inches of rain per year i think. :)
Atmosphere.................
The Rhine River's name is derived from a Celtic word 'Rēnos'.
The first word is Sink and the second is denser
