If Gina leaves now and drives at 66 kmh she will reach Alton

If Gina leaves now and drives at 66 km/h, she will reach Alton just in time for her appointment. On the other hand, if she has lunch first and leaves in 40 minutes, she will have to drive at 90 km/h to make her appointment. How far away is Alton?

66X=90(X-2/3)
66X=90X-90*2/3
66X=90X-180/3
66X=90X-60
66X-90X=-60
-24X=-60
X=-60/-24
X=2.5
66*2.5=165 KM
90(2.5-2/3)
90(11/6)
990/6=165 KM