Eighth grade, the first volume of mathematics, all the answers.
Let x seconds later, the area of △QCP is equal to one third of the area of △ABC, and CQ = 6-x and CP = 2x can be calculated.
△ one third△ △ABC area = 1/3 * 1/2 *8*6=8.
(6-X)*2X* 1/2=8
X=2 or 4