Answer:
D
Step-by-step explanation:
x²-4x-12≤0
x²-6x+2x-12≤0
x(x-6)+2(x-6)≤0
(x-6)(x+2)≤0
x=6,-2
∴ value of x lies between -2 & 6
X = 1/2 and x is also equal to 1/5
Average speed = (total distance) / (total time)
Average speed = (192 km) / (8 hours) = 24 km per hour .
I believe the answer is A. Plane
