11(х - 2) = 9(х + 2)
11х - 22 = 9х + 18
11х - 9х = 18 + 22
2х = 40
х = 40 : 2
х = 20 (км/час)
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11(х - 2) = 9(х + 2)
11х - 22 = 9х + 18
11х - 9х = 18 + 22
2х = 40
х = 40 : 2
х = 20 (км/час)