I. 6x²+11x+3=0

II 20y²+9y+1=0

I. 30x²+17x+2=0

II 3y²+8y+4=0

I. 4x²-13x+10=0

II 2y²-15y+22=0

I. x²-10x+25=0

II y²-9y+20=0

I. 2x²-9x+4=0

II y²-14y+40=0

The speed of a boat in still water is 16km/h and the speed of the current is 2 km/h. The distance travelled by the boat from point A to point B downstream is 12 km more than the distance covered by the same boat from point B to point C upstream in the same time. How much time will the boat take to travel from C to B downstream