SOLUTION: A small plane took 3 hours to fly 960 km from Ottawa to Halifax with a tail wind. On the return trip, flying into the wind, the plane took 4 hours. Find the wind speed and the spee

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: A small plane took 3 hours to fly 960 km from Ottawa to Halifax with a tail wind. On the return trip, flying into the wind, the plane took 4 hours. Find the wind speed and the spee      Log On


   

Question 1007975: A small plane took 3 hours to fly 960 km from Ottawa to Halifax with a tail wind. On the return trip, flying into the wind, the plane took 4 hours. Find the wind speed and the speed of the plane in still air.

A solution of 10% sulfuric acid and one of 25% sulfuric acid are to be used to make 500 ml of 20% sulfuric acid. How many ml of each solution needs to be used in the mixture? (round answers to the nearest ml)
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
WhichWay    rate       time      distance
O to H      r+w         3        960
H to O      r-w         4        960

system%28%28r%2Bw%29%2A3=960%2C%28r-w%29%2A4=960%29;
Solve the system.

x, volume of the 10% solution
500-x, volume of the 25% solution
%2810x%2B25%28500-x%29%29%2F500=20