N 6,7,8 _______________________________

Question

N 6,7,8 _______________________________

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Answer 1

6. Р=(10+3)*2=26
7. 4
8. Ск пас=80
Ск поч=х
S=1280
1280/х - 1280/80=4
1280/х=20
х=64 км/ч