Quadratic Formula and sovling a Word Problem

I need some help on sovling this word problem using Quadratic Formula. Well, I can sovle it I just need help finding the a,b and c of the formula.

"As a factory group leader, you are to facilitate the building of hinge plates for a special application of the “Help Rebuild New Orleans” foundation. Your boss gives you a few restrictions: The trapezoidal plate must have a height three inches greater than its primary base and, the ratio of the secondary base to the primary base is six tenths. __If the budget only allows you 4800 in3 of ¼” stock sheet metal, what are the dimensions of each plate?"__

My teacher messed up it was changed to what is in red down below I am sorry for being so confusing.

"As a factory group leader, you are to facilitate the building of hinge plates for a special application of the “Help Rebuild New Orleans” foundation. Your boss gives you a few restrictions: The trapezoidal plate must have a height three inches greater than its primary base and, the ratio of the secondary base to the primary base is six tenths. *If you are to make 1200 plates and the budget only allows you 4800 in3 of ¼” stock sheet metal, what are the dimensions of each plate?"*

I see were the 4800 comes from now.

Thank you bunches!