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Also1987

Ответ:

Объяснение:

Велосипедист х км/ч

Мотоцикл. (Х+18)км/ч

Сост ур

4/х=10/(х+18)

4х+72=10х

6х=72

Х=12 км/ч скорость велосипедист

12+18=30 км/ч скорость мотоциклиста

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