5. 1/6 * 1/2x = 30
x = 150
6.
x = 7 (часов)
7. 0,3x + 3,5 = 1/2x
x = 17,5 (км)
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5. 1/6 * 1/2x = 30
x = 150
6.
x = 7 (часов)
7. 0,3x + 3,5 = 1/2x
x = 17,5 (км)