Предмет: Математика, автор: 7152250524

решить задачу для 4 класса : Самолёт летел из Москвы в Иркутск . Сначала он летел 3 ч со скоростью 620 км в час ,затем несколько часов со скоростью 600 км в час , а в конце пути 4 ч со скоростью 493 км в час . Сколько часов затратил самолёт на весь перелёт , если расстояние от Москвы д Иркутска 5032 км ?

Ответы

Автор ответа: Бибинур

Москва- Иркутск

3 ч. - 620 км/ч

? ч. - 600 км/ч

в конце 4 ч. - 493 км/ч

Расстояние- 5032 км

Время -? ч

1) 3*620= 1860(км) пролетел за 3 часа

2)4*493=1972(км) пролетел за 4 часа

3) 1860+1972=3832(км) пролетел за 7 часов

4)5032-3832=1200(км) осталось пролететь

5)1200/600=2 (ч) пролетел со скоростью 600 км/ч

6)3+4+2=9(ч) длился весь полет

Ответ 9 часов!

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