1. The problem statement, all variables and given/known data "A tank can be filled in 6 hours using 2 pipes. The larger pipe alone would fill it 5 hours sooner than the smaller pipe alone. How long would each pipe alone take?" 2. Relevant equations I know it involves a quadratic not sure on the rest... I cant see how to do with a quadratic i mean. 3. The attempt at a solution assume a is the big pipe and b is the small A+B=6 A=B+5 solved them to get a=11/2hours and b=1/2, i can see thats not right. i said that a was the bigger one and my answer says that its not????