Предмет: Математика, автор: elenabechmeteva

Два велосипедиста едут по круговой дорожке длиной 1,2 км каждый со своей

постоянной скоростью. Они выехали одновременно. Первые 5 кругов первый

велосипедист проехал на 9 минут быстрее, чем второй, а еще через 27 минут

поравнялся  со  вторым.  Найдите  скорость  второго  велосипедиста.  Ответ

выразите в км/ч.

 

Ответы

Автор ответа: няшка252
0
Пусть скорость первого равна у, второго х  по условию они проехали 5 кругов что в км равно 5*1.2=6км ;
, так как  9 минут в часах это  ; 
 Теперь по условию отсчет времени идет  с того времени когда  второй велосипедист сделал 5 кругов. За это время первый проехал еще ,  тогда 

решая систему получим  ответ 10км в час

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