#### Answer

The chef cost 35 dollars per hour, the salad maker costs 20 dollars per hour, and the server costs 15 dollars per hour.

#### Work Step by Step

Let c be the cost of the chef, m be the cost of the salad maker, and s be the cost of the server. Thus, we obtain:
$ c + m + s = 70 \\ m = s +5 \\ c = s + m$
We plug equation three into equation one to find:
$ c + c = 70 \\ c = 35$
We plug equation two into equation three to find:
$ c = s + s + 5 \\ 35 = 2s +5 \\ 2s = 30 \\ s= 15 $
Thus, we obtain:
$m = s+5 = 15 + 5 = 20$