Answer:
20,320 feet
Step-by-step explanation:
Let Mt Rainer be X.
Let Mt KcKinley be X+5,910.
So, X + (X + 5,910) = 34,730
Combine the variables and, 2X + 5,910 = 34,730
Subtract 5,910 from both sides and, 2X = 28,820
Divide both sides by 2 and, X = 14,410
So, Mt Rainer is 14,410 and Mt McKinley is (14,410 + 5,910) = 20,320
