Answer:
B
Step-by-step explanation:
if it is a vertical line, x=1 for all values of y
Let the speed of first car be x mph
the speed of the second one is (x+3) mph
Relative speed=x+x+3=(2x+3) mph
but
time=distance/speed
thus
3=(261)/(2x+3)
solving for x we get:
3(2x+3)=261
6x+9=261
6x=261-9
6x=252
hence:
x=42 mph
Thus the average speed of first car is 42 mph
Average speed of the second car is (42+3)=45 mph
(18 * 4) + (1500 * .13) = total rental cost
18 * 4 = 72
1500 * 0.13 = 195
72 + 195 = 267
His total rental cost is $267.