Car a and car b both depart the same location (point p) and drive on the same road in the same direction at the same speed. right now, car b is six times as many miles from point p as car a is. after both cars travel 45 more miles, car b will be three times as many miles from point p as car a.

which function shows the ratio of car a’s position to car b’s position after each vehicle travels x miles from point p?

a r(x)=30 + x45 + x

b r(x)=75 + x180 + x

c r(x)=30 + x180 + x

d r(x)=75 + x225 + x