<span>x(3x+5)-4(3x+5)
3x^2+5x-12x+20
3x^2-7x+20</span>
Always add them all around and then divide the two and you should get the correct answer
As it stands, it's none of those. I believe you were going for the distance formula but copied it wrong.
I pretty sure the answer is 3.2 hours. I'm not completely sure though....
