Предмет: Математика, автор: Valeria20050905

Сколько километров пройдёт теплоход за 6 часов,двигаясь против течения реки,если его собственная скорость 21 км/ч,а скорость теченич составляет 2/35 собственной скорости катера?5КЛАСС!!!!ПОЛСКАЖИТЕ ПОЖАЛУЙСТА!!!

Ответы

Автор ответа: Света0769754

0

а) Двигаясь по течению реки, катер за 4 часа прошел 72 км. Какова собственная скорость катера, если скорость течения реки - 2 км/ч? б) Двигаясь против течения реки, теплоход за 3 ч прошел 63 км. Какова скорость течения реки, если собственная скорость теплохода - 23 км/ч в) При движении против течения реки расстояние в 126 км моторная лодка проходит за 7 ч. Какова скорость лодки в стоячей воде, если плот то же расстояние проходит за 63 часа? г) Двигаясь по течению реки, расстояние в 72 км теплоход проходит за 3 ч, а плот за 18 ч. Какова скорость теплохода при движении против течения?

Автор ответа: konstantinstar1

0

21*2/35=1,2 км/ч скорость сечения
21-1,2=19,8 - скорость теплохода против течения
19,8*6=118,8 км-пройдет теплоход против течения за 6часов

Автор ответа: Valeria20050905

0

Спасибо)

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