Предмет: Математика, автор: Граня1

сделайте пожалуйста номер 643

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Автор ответа: dianatitkina

0

пусть х - скорость одного катера, тогда скорость другого - 78х. Двигаясь с общей скоростью, они должны проехать 25 км за 512 часа. Когда объекты двигаются навстречу друг другу, скорости складываются.

1) (х+78х)*512=25

х+78х=25:512

1 78х=25:5*12=60

х=60:1 78

х=32 кмч - скорость одного катера

2) 32*78=28 кмч - скорость второго катера.

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