It is known that, as shown in the figure below, in the trapezoidal ABCD, ad is parallel to BC, ad = 24cm, BC = 30cm, and point P moves from point a to D at a speed of 1cm / s, Stop at point D. point Q moves at a speed of 2cm / s from point C to point B, and stops at point B. the truncated trapezoid of line PQ is two quadrilaterals. When P.Q starts at the same time, a few seconds later, one of the quadrilaterals is a parallelogram?

It is known that, as shown in the figure below, in the trapezoidal ABCD, ad is parallel to BC, ad = 24cm, BC = 30cm, and point P moves from point a to D at a speed of 1cm / s, Stop at point D. point Q moves at a speed of 2cm / s from point C to point B, and stops at point B. the truncated trapezoid of line PQ is two quadrilaterals. When P.Q starts at the same time, a few seconds later, one of the quadrilaterals is a parallelogram?

Let 10s and 8s be parallelogram equation after T seconds: 1 * t = 30-2 * t 24-1 * t = 2T, t = 10s, t = 8s