HELP PLEASE EXPLAIN THIS WELL !

Question

Elizabeth travels from Crocville to Barratown. For the first x km she can travel at 80 km/h, but after that she has to reduce her speed to 60 km/h.

It takes Elizabeth 3 hours to travel the 200 km from Crocville to Barratown.

How far does Elizabeth drive at 80 km/h?

Answer 1

200/3 = 80x + 60y

200 km in 3 hours= 66 2/3 km/hr = average speed

66 2/3 -60 = 6 2/3

80-66 2/3 = 13 1/3

13 1/3 = twice 6 2/3

she drive twice as long at 60 as at 80 km/hr

2 hours at 60, 1 hour at 80

2x60 =120

1x80 = 80

120+80 = 200 km