Предмет: Алгебра, автор: myapple1986

Экскурсанты за день прошли 25,7 км. С утра они шли 5 час(-а), а после обеда — ещё 4 час(-а). Сколько километров экскурсанты прошли утром, если после обеда их скорость снизилась на 1 км/ч. С какой скоростью шли экскурсанты утром?
Экскурсанты утром прошли
км со скоростью
км/ч.

Ответы

Автор ответа: shirinkitty2006

2

До обеда ребят шли со скоростью х км/ч

После обеда они шли со скоростью (х -2 ) км/ч

х * 5 + (x -2) * 3 = 23,6

5х+3х= 23,6+6

8х= 29,6

х= 29,6/8= 3,7 км/ч утром

До обеда ребят шли со скоростью х км/ч

После обеда они шли со скоростью (х -2 ) км/ч

х * 5 + (x -2) * 3 = 23,6

5х+3х= 23,6+6

8х= 29,6

х= 29,6/8= 3,7 км/ч утром

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