Answer:
The cities are 495 miles apart.
Explanation:
Let x represent the distance between the two cities.
Let t represent the time taken by the plane to fly between the two cities.
The plane flew between two cities at 330 mph.
Distance = speed × time
Distance covered by the plane would be
330 × t = 330t
A car went the same distance at 55 mph. If the car took 7.5 hours longer, means that the time spent by the car would be (t + 7.5) hours and distance travelled would be
55(t + 7.5) = 55t + 412.5
Since the distance is the same, then
330t = 55t + 412.5
330t - 55t = 412.5
275t = 412.5
t = 412.5/275
t = 1.5
the distance between the two cities would be
1.5 × 330 = 495 miles