Why does sound travel faster in moist air than in dry air ?

Why does sound travel faster in solids that in gases?

In which medium the speed of sound is greater : in moist air or in dry air ?

Statement-1 : Sound travels faster in moist air Statement-2 : The density of moist air is less then density of dry air.

The velocity of sound in moist air is more than in dry air because the moist air has