Предмет: Математика, автор: длб

Расстояние между 2-мя причалами равно 16,8 км. За сколько времени моторная лодка проплывет путь от одного причала до другого и обратно ,если собственная скорость 11,2 км/ч ,а скорость течения реки составляет 25 % скорости лодки.

Ответы

Автор ответа: nataly77

1) 11,2:100*25=2,8 (км/ч) - скорость течения реки

2) 11,2+2,8=14 (км/ч) - скорость лодки по течению

3) 11,2-2,8=8,4 (км/ч) - скорость лодки против течения

4) 16,8:(14+8,4)=16,8:22,4=0,75=3/4ч.

Ответ: на весь путь потребуется 45 минут.

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