Предмет: Математика, автор: Aziz15

Собственная скорость весельной лодки в 3 раза больше скорости течения. Весельная лодка, двигаясь 0,75ч против течения затем 2ч по течению, прошла 19ч км. найдете собственную скорость весельной лодки и скорость течения

Ответы

Автор ответа: таня90
0
х км/ч - скорость течения
3х км/ч - скорость лодки
(3х+х)=4х км/ч - скорость по течению
(3х-х)=2х км/ч - скорость против течения
4х*2+2х*0,75=19
8х+1,5х=19
9,5х=19
х=19:9,5
х=2(км/ч) - скорость течения
2*3=6(км/ч) - скорость лодки
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