Question 631023
A plain flies at a cruising speed of (x+4) kilometers per hour. At this rate, how long will it take to fly x2+11x+28 kilometers?
1/(x+4) * x^2+11x+28
1/(x+4) * (x+7)(x+4)
(x+7)(x+4)/(x+4) 
(x+7) hours