The hash rate is easily obtained from 'getmininginfo' in debug console.
So

"networkhashps" : 69430483746

69430483746 / (10 ^ 9) = 69.43 Gigahashes per second

It was the nodes part is not so obvious, btw have you noticed if this is accurate we only have around ~248 wallets online around the world,

masternodes =3222
active nodes =3470

hot wallets = 248

sounds too low don't you think? I am not sure I believe this figure, just the hot wallets for the exchanges must be quite a few for starters ..