ok..so the question is...

"During a chemical reaction, a compound is being made from two other substances. At timethours after the start of the reaction, x g of the compound has been produced. Assuming that x = 0 initially, and that

dx= 2(x-6)(x-3)

dt

show that it takes approximately 7 minutes to produce 2 g of the compund."

We have been started off with...

the integral of 1 over (x-6)(x-3) dx = the integral of 2 dt

i don't have any idea where this came from or why it is the first step...can anyone help?