Question 1190421
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You already stated that 
"Vehicle B travels a miles per hour faster than Vehicle A"
which means it doesn't make sense why you ask about Vehicle B's speed in your last sentence.


For the last sentence, I'm assuming that you meant to say 
"Vehicle B travels how much <font color=red>further</font> than Vehicle A, in miles?"


Distance = Rate*Time
Rate = speed<table border = "1" cellpadding = "5"><tr><td>Vehicle</td><td>Distance</td><td>Speed</td><td>Time</td></tr><tr><td>A</td><td>x^2</td><td>x</td><td>x</td></tr><tr><td>B</td><td>(x+a)(x+b)</td><td>x+a</td><td>x+b</td></tr></table>Vehicle B distance = rate*time
Vehicle B distance = (x+a)(x+b) 
Vehicle B distance = x^2 + bx + ax + ab 
Vehicle B distance = x^2 + (a+b)x + ab


Subtract off Vehicle A's distance of x^2
B - A = (x^2 + (a+b)x + ab) - (x^2)
B - A = (a+b)x + ab
B - A = ax + bx + ab
This represents how much further vehicle B has traveled compared to vehicle A.
The units are in miles.


It looks like choice C might be a match assuming there's a typo and the ax+ax should actually be ax+bx
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