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Hello can some one solve this word problem for me? thank you

It took betty 4.5 hrs to drive to her mother's house on Sat morning. On her return trip on Sun night, traffic was heavier, so her trip took her 5 hrs. Her average speed on Sun was 7 mph slower than Sat. What was her average speed on Sun.


Let Betty's average speed Sunday = x mph
          average speed on Saturday = (x+7) mph
The distance = 5*x  = 4.5(x+7)
                   ⇒ 5x = 4.5x +31.5
                   ⇒  x = 63 mph
Betty's average speed on Sunday is 63 mph

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