Please help. Hyperbola. Algebra 2. Find equation. So confused

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?

Keith runs 5 miles in 38 minutes. at the same rate, how many miles would he run in 57 minutes

How many revolutions will a car wheel of diameter 28 in. make over a period of half an hour if the car is traveling at 60 mi/hr? the final answer is supposedly 21,609 but i have no idea how to get that, show work : )