Предмет: Математика, автор: Yuhiko

Моторная лодка прошла вверх по реке 60 км, а вниз 150 км. Найдите среднюю скорость лодки на всем пути, если ее собственная скорость 20 км/ч, а скорость течения 4 км/ч

Ответы

Автор ответа: uyrasik

165

1) 20 км/ч + 4 км/час = 24 км/час - скорость по течению

2) 20 км/час - 4 км/час = 16 км/час - против течения

3) 60 км : 16 км/час = 3.75 часа = 3ч 45 мин - шла вверх по реке

4) 150 км : 24 км/час = 6.25 часа = 6 ч 15 мин - вниз по реке

5) ( 60 км + 150 км) : ( 3ч 45м + 6ч 15 мин) = 210 км : 10 часов = 21 км/час - средняя скорость

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1. Why do we say that social interaction is patterned?
2. What does culture provide?
3. So, according to what is our behaviour patterned?
4. What may this assertion provoke?
5. Does behaving in patterned ways threaten our individuality in any way?
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